Ending the coronavirus pandemic would be 'very, very easy' compared with the challenge of climate change, Bill Gates has said.
The founder of Microsoft said that if we manage to solve global warming it would be 'the most amazing thing humanity has ever done'.
But he said: 'We've never made a transition like we're talking about doing in the next 30 years. There is no precedent for this.'
The billionaire spoke to the BBC about his new book, How to Avoid a Climate Disaster.
He said that the world typically adds 51 billion tonnes of greenhouse gases to the atmosphere ever year, but that we need to get to net zero – meaning there must be a drastic reduction, and all the gases that do end up being added are offset by initiatives such as planing trees.
His book says that there needs to be a focus on technology to help us offset more carbon emissions and reduce the need for them.
At the moment, renewable energy can help decarbonise electricity.
But the other 70% of the world's economy includes transport, steel, cement, fertiliser production and more, which is much more difficult to run without fossil fuels.
Mr Gates said that governments must take the lead in pushing for innovation, with investment for research.
'We need to have price signals to tell the private sector that we want green products,' he said.
The philanthropist has donated tens of millions of dollars to the scientific fight against coronavirus through his Gates Foundation.
In an extract from his book published on his blog , Mr Gates says: 'The case for zero [emissions] was, and is, rock solid.
'Setting a goal to only reduce our emissions—but not eliminate them—won't do it. The only sensible goal is zero.'
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