G ravely brandishing a banner reading “Climate Justice” and guiding a crowd of young people through a muddy Kampala market, Leah Namugerwa is in her element.

To mark the global climate strike on 29 November, the 15-year-old Ugandan activist, who co-runs Africa’s most prominent chapter of Fridays for Future, marches along the shores of Lake Victoria, leading a chant until her voice grows raw.

Namugerwa has made waves in her short time as a climate activist, meeting foreign ambassadors and Uganda’s speaker of parliament and attending conferences in Rwanda, Kenya, and Switzerland. But she appears most comfortable in her gumboots on the picket line.

“I want to raise a generation that cares about the environment,” she says. “At least if the leaders can’t make a difference, we can make a difference. We, as kids, we’re not too young to make a positive difference.”

Young east Africans stand to be among the worst affected by climate change, which can impact everything from crop production to malnutrition and the spread of disease.

Climate change: Decade's defining issue in pictures Show all 20 1 /20 Climate change: Decade's defining issue in pictures Climate change: Decade's defining issue in pictures California In this decade, humans have become ever more aware of climate change. Calls for leaders to act echo around the globe as the signs of a changing climate become ever more difficult to ignore Getty Climate change: Decade's defining issue in pictures Athens, Greece Fierce wildfires have flared up in numerous countries. The damage being caused is unprecedented: 103 people were killed in wildfires last year in California, one of the places best prepared, best equipped to fight such blazes in the world AFP/Getty Climate change: Decade's defining issue in pictures Redding, California Entire towns have been razed. The towns of Redding and Paradise in California were all but eliminated in the 2018 season AP Climate change: Decade's defining issue in pictures Athens, Greece While wildfires in Greece (pictured), Australia, Indonesia and many other countries have wrought chaos to infrastructure, economies and cost lives AFP/Getty Climate change: Decade's defining issue in pictures Carlisle, England In Britain, flooding has become commonplace. Extreme downpours in Carlisle in the winter of 2015 saw the previous record flood level being eclipsed by two feet AFP/Getty Climate change: Decade's defining issue in pictures Hebden Bridge, England Hebden Bridge in West Yorkshire has flooded repeatedly in the past decade, with the worst coming on Christmas Day 2015. Toby Smith of Climate Visuals, an organisation focused on improving how climate change is depicted in the media, says: "Extreme weather and flooding, has and will become more frequent due to climate change. An increase in the severity and distribution of press images, reports and media coverage across the nation has localised the issue. It has raised our emotions, perception and personalised the effects and hazards of climate change." Getty Climate change: Decade's defining issue in pictures Somerset, England Out west in Somerset, floods in 2013 led to entire villages being cut off and isolated for weeks Getty Climate change: Decade's defining issue in pictures Dumfries, Scotland "In summer 2012, intense rain flooded over 8000 properties. In 2013, storms and coastal surges combined catastrophically with elevated sea levels whilst December 2015, was the wettest month ever recorded. Major flooding events continued through the decade with the UK government declaring flooding as one of the nation's major threats in 2017," says Mr Smith of Climate Visuals Getty Climate change: Decade's defining issue in pictures London, England Weather has been more extreme in Britain in recent years. The 'Beast from the East' which arrived in February 2018 brought extraordinarily cold temperatures and high snowfall. Central London (pictured), where the city bustle tends to mean that snow doesn't even settle, was covered in inches of snow for day PA Climate change: Decade's defining issue in pictures London, England Months after the cold snap, a heatwave struck Britain, rendering the normally plush green of England's parks in Summer a parched brown for weeks AFP/Getty Climate change: Decade's defining issue in pictures New South Wales, Australia Worsening droughts in many countries have been disastrous for crop yields and have threatened livestock. In Australia, where a brutal drought persisted for months last year, farmers have suffered from mental health problems because of the threat to their livelihood Reuters Climate change: Decade's defining issue in pictures Tonle Sap, Cambodia Even dedicated climate skeptic Jeremy Clarkson has come to recognise the threat of climate change after visiting the Tonle Sap lake system in Cambodia. Over a million people rely on the water of Tonle Sap for work and sustinence but, as Mr Clarkson witnessed, a drought has severley depleted the water level Carlo Frem/Amazon Climate change: Decade's defining issue in pictures Addis Ababa, Ethiopia In reaction to these harbingers of climate obliteration, some humans have taken measures to counter the impending disaster. Ethiopia recently planted a reported 350 million trees in a single day AFP/Getty Climate change: Decade's defining issue in pictures Morocco Morocco has undertaken the most ambitious solar power scheme in the world, recently completing a solar plant the size of San Francisco AFP/Getty Climate change: Decade's defining issue in pictures London, England Electric cars are taking off as a viable alternative to fossil fuel burning vehicles and major cities across the world are adding charging points to accomodate AFP/Getty Climate change: Decade's defining issue in pictures Purmerend, The Netherlands Cities around the world are embracing cycling too, as a clean (and healthy) mode of transport. The Netherlands continues to lead the way with bikes far outnumbering people Jeroen Much/Andras Schuh Climate change: Decade's defining issue in pictures Xiamen, China Cycling infrastructure is taking over cities the world over, in the hope of reducing society's dependency on polluting vehicles Ma Weiwei Climate change: Decade's defining issue in pictures Chennai, India Despite positive steps being taken, humans continue to have a wildly adverse effect on the climate. There have been numerous major oil spills this decade, the most notable being the BP oil spill in the Gulf of Mexico in 2010 AFP/Getty Climate change: Decade's defining issue in pictures Amazon rainforest, Brazil More recently, large swathes of the Amazon rainforest were set alight by people to clear land for agriculture AFP/Getty Climate change: Decade's defining issue in pictures California This decade may have seen horrors but it has led to an understanding that the next decade must see change if human life is to continue Getty

Namugerwa, who has been walking out of classes every Friday since February, has spearheaded a tree-planting campaign and a petition to enforce the country’s plastic bag ban. She was inspired to take action at 13, after watching news reports of mudslides and flooding in rural parts of the country.

“[This was] not people being hit by gunshots – this was nature,” she says. “My fellow students losing schools, losing their parents, losing crops… It was really disturbing.”

When her father and uncle, the latter an outspoken environmentalist, explained that the root cause of the damage was climate change, she began researching online and created a Twitter account dedicated to climate awareness.

Namugerwa, making protest signs, says: ‘At least if the leaders can’t make a difference, we can make a difference. We, as kids, we’re not too young to make a positive difference’ (Portia Crowe)

She tweets prolifically, occasionally tagging the president, but is not even demanding new environmental policies. Rather she is merely calling for existing legislation to be enforced. The government has unsuccessfully tried to ban plastic bags half-a-dozen times, for example, and like many countries, Uganda has signed and ratified the Paris Climate Agreement but done little towards implementing it.

It was through Twitter that Namugerwa discovered Greta Thunberg and was inspired to stage her own school strikes.

“Leah held her first strike in February and I remember it was not even a Friday,” says Fridays for Future Uganda co-founder Sadrach Nirere, a student at Kampala International University. “It was like a Tuesday, then the next Friday, the next Tuesday – she was very eager.”

Her first placard simply read “School Strike for Climate”, inspired by Thunberg’s frank message. (The two teenagers met at COP25 in Madrid, but had previously been direct-messaging on Twitter, according to Namugerwa.)

She joined forces with Nirere, Fridays for Future Uganda's co-founder Hilda Flavia Nakabuye and her cousin, Bob Motavu to form Fridays for Future Uganda, and they began planning larger events in addition to the weekly walkouts.

The group has not received much institutional support.

“The first teacher I talked to about it told me that what I’m doing is useless,” says Nakabuye. “He thinks climate change is God’s plan and I cannot do anything about it since I’m human.”

Attendance does not directly affect the students’ grades, but in a country where education is all-important, missing class every week is severely frowned upon. That has made it difficult to grow the organisation – many of Namugerwa’s friends are prevented by their parents from taking part.

Her own parents, however, are more encouraging.

Some protests have drawn nearly 1,000 participants (Portia Crowe)

“I’m not worried,” says Namugerwa’s father, Lukwago Cephas. “The education might also be useless if we don’t have a future.”

He and her siblings were present for the 29 November strike at Kampala’s Ggaba Beach. About 40 young people spent an hour picking up plastic and rubbish from the lakeshore before marching through Ggaba market. (The organisers say previous protests have drawn nearly 1,000 participants but this one took place when many students were sitting exams and others had already gone home for the holidays.)

Dorothy Nalubega was there on behalf of a women’s agriculturalist and environmental group.

“We have to join the young ones,” she says. “You cannot separate climate change with agriculture… With the prolonged droughts, the floods, you cannot achieve the yields with the climate crisis.”

Some of the protesters are young children, who are being joined by adults (Portia Crowe)

Other participants included girls from a home for orphaned and disadvantaged children, as well as Peter Selujja, a fisherman who lives and works in Ggaba market.

“This is my country – I want everything to be clean,” he says, pointing to plastic bottles washing up on shore. “Fish are dying. I cry from my heart when I see it.”

Such protests are technically illegal in Uganda, where police permission is required for gatherings of three or more people that could be deemed political. The permit process often gets bogged down in bureaucracy until the date of the intended event has passed. “Now imagine if we never went on to do what we do [because of this],” says Nirere.

“You have to be big-headed,” Nakabuye adds.

They do worry about their safety, however. With the rise of the opposition People Power movement, comprised mainly of young people and led by reggae-musician-turned-member-of-parliament Bobi Wine, the students fear their climate activism could be misconstrued as politically driven.

“People are trying to politicise youth action,” Nirere says.

That can be dangerous in a country where even prominent opposition leaders are openly attacked in public. But Namugerwa is less concerned.

“My safety? I think that will make more climate awareness, if they try to [arrest me]” she says. “If that happens, [the media] will have to come.”

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Then there is her online security – she faces bullying from internet trolls both in Uganda and abroad. Some criticise her choice of cause, others take a more racist tone.

Namugerwa’s uncle, Tim Mugerwa, whose organisation Green Campaign Africa informally supports Fridays for Future Uganda, acknowledges the pressure she faces at such a young age, but says as long as she is happy to do it, nobody should stop her.

“It’s part of her learning process – it’s part of the training she’s supposed to get in class,” he says.

Mugerwa, who intends to run for president in 2021 on a green platform, says political issues like unemployment and inequality are symptoms of the broader climate change problem.

Namugerwa agrees. Her hope lies in the youth – Uganda has one of the world’s youngest populations, with a median age of just 15. It’s a potentially important resource, though tapping it may be easier said than done. She admits she has a larger following abroad than at home, and winning over her young peers will be her next big challenge.