Climate impacts will affect agriculture the most, a key sector in the poorest countries and major source of income, food security, nutrition, jobs, livelihoods and export earnings. By 2030, crop yield losses could mean that food prices would be 12 percent higher on average in Sub-Saharan Africa. The strain on poor households, who spend as much as 60 percent of their income on food, could be acute. The resulting malnutrition could lead to an increase in severe stunting in Africa of 23 percent.

At the global level, warming of 2-3°C could increase the number of people at risk for malaria by up to 5 percent, or more than 150 million more people affected. Diarrhea would be more prevalent, and increased water scarcity would have an effect on water quality and hygiene.

The result would be an estimated 48,000 additional deaths among children under the age of 15 resulting from diarrheal illness by 2030.

To prevent this grim picture becoming reality, the report prescribes “good” development that is rapid, inclusive and climate-informed. This includes continuing and expanding programs that reduce poverty while increasing people’s capacity to prepare for and cope with shocks. For instance, in Kenya, the Hunger Safety Net Program prevented a five percent increase in poverty among beneficiaries following the 2011 drought.

These efforts will need to be coupled with targeted climate adaptation measures, such as protective infrastructure like dikes and drainage systems and mangrove restoration to deal with flooding, changing land-use regulations to account for sea level rise, disaster preparedness, and introduction of climate-resistant crops and livestock breeds.

In Uganda, the combination of new crop varieties and extension visits increased household agricultural income by 16 percent.

The report looks at different scenarios to 2030 and finds without good development more than 100 million additional people would be living in poverty. In India alone, an additional 45 million people could be pushed back over the poverty line by 2030, primarily due to agricultural shocks and increased incidence of disease.

“The report demonstrates that ending poverty and fighting climate change cannot be done in isolation – the two will be much more easily achieved if they are addressed together,” said Stephane Hallegatte, a senior economist at the World Bank who led the team that prepared the report. “And between now and 2030, good, climate-informed development gives us the best chance we have of warding off increases in poverty due to climate change.”

In the longer term, only immediate and continued efforts to reduce global emissions will save poor people from climate impacts, according to the report. To be successful, governments should design mitigation policies so that they protect, and even benefit, poor people. And action can be taken to reduce the burden of policies that would impose new costs – such as by strengthening social protection and assistance, or using cash transfers.

One analysis of 20 developing countries showed that collecting and redistributing energy taxes would benefit poor people despite higher energy prices, with the bottom 20 percent of the population experiencing a net $13 gain for each $100 of additional tax. Well-designed emissions-reductions programs that strengthen the productivity of agriculture and protect ecosystems could benefit 20-50 million low-income households by 2030 through payments for ecosystem services.

The report argues that in the poorest countries, domestic resources may be insufficient to put in place such measures, and international support will be essential. This is particularly true for investments that involve high immediate costs but are urgently needed to prevent lock-ins into carbon-intensive patterns, such as for urban transport, energy infrastructure, or deforestation.

Shock Waves: Managing the Impacts of Climate Change on Poverty differs from previous efforts by looking at the poverty impacts of climate change at the household level, rather than at the level of national economies. The report combines the findings from household surveys in 92 countries that describe demographic structures and income sources with the most recent modeling results on the impacts of climate change on agriculture productivity and food prices, natural hazards such as heat waves, flood and drought, and climate-sensitive diseases and other health consequences.

Funding for the report came from the Global Facility for Disaster Reduction and Recovery (GFDRR) and the UK’s Department for International Development (DFID).