Harrison Ford has issued a stark warning about the impending impact of climate change, in what he's called the 'greatest moral crisis of our time'.

The Star Wars legend's character may have once helped to fight off evil forces in a galaxy far, far away, but now the actor behind Han Solo is spearheading an assault on a threat much closer to home - climate change.

Ahead of his speech at the World Government Summit in Dubai on Sunday, the 76-year-old delivered a powerful message in a pre-recorded video urging government officials to take 'action' against climate change 'now'.

Asking 'What does living in a four-degrees warmer world look like?,' Ford warns that water shortages, rising emissions and 'worldwide destruction' would all be inevitable consequences of inaction.

'Is this the world we want?,' asked Ford. 'Our planet - the only home we've got - is suffering.

'This is the bare truth; this is our reality.'

Ford ended the impassioned message with a rallying cry to take action now, before any damage is irrevocable.

The Hollywood actor has long been an outspoken environmentalist and relentless campaigner for climate change awareness.

He currently serves as the executive vice chairman of Conservation International, which has been running for 32 years.

Set to speak at a Dubai summit on Sunday, the 76-year-old delivered a powerful message in a pre-recorded video urging government officials to take 'action' against climate change

In his several decades long forthright crusade, Ford has been incredibly critical of political leaders who deny the evidence of climate change.

In 2017, the the second highest grossing box office actor of all time - amassing an staggering $4.963 billion - took a series of swipes at Donald Trump for his opinions about global warming.

'We face an unprecedented moment in this country. Today's greatest threat is not climate change, not pollution, not flood or fire,' Ford said during an acceptance speech of the Founder's award in LA.

'It's that We've got people in charge of some important sh*t who don't believe in science.'

During his presidential bid and beyond, President Trump has repeatedly tried to mythologize global warming, regularly conflating cold bursts of weather with long-term climate change.

President Trump has repeatedly tried to mythologize global warming. Last week he tweeted asking Global Warming to return during a cold snap in the Mid-West (left and right)

Ford currently serves as the executive vice chairman of Conservation International, which has been running for 32 years

'What the hell is going on with Global Warming?' Trump asked after temperatures plummeted in the Mid-West last month. 'Please come back fast, we need you!'

The President also made no mention of Climate Change in his State of the Union address this week, despite an increase in evidence showing its effects.

Attempting to debunk the President's hypothesis, Jason Furtado, a meteorologist at the University of Oklahoma told the Washington Post: 'One down day on the Dow Jones doesn’t mean the economy is going to trash'

The Star Wars legend took a series of swipes at Trump in 2017, for his opinions on climate change

'One cold day doesn’t suddenly mean that the general trend in global climate change is suddenly going in the opposite direction,' he added.

On Wednesday, experts from NASA and the National Oceanic and Atmospheric Administration announced that 2018 was the fourth-warmest year on record.

Even more alarmingly, five of the hottest years ever have all come in the last five years, with 2016 topping the pack.

In his 2017 speech, Ford concluded: 'If we don't stop the destruction of nature, nothing else will matter. Jobs won't matter; our economies won't matter; our freedoms and ethics won't matter; our children’s education and potential won’t matter, peace, prosperity.

'If we end the ability of a healthy natural world to sustain humanity nothing else will matter, simply'.