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Bill Gates has outlined three things he's become convinced will avoid a 'climate disaster'.
Tomorrow (16 February), the 65-year-old Microsoft co-founder will release his new book How To Avoid A Climate Disaster and he's shared an excerpt.
Gates believes we need to completely eliminate greenhouse gas emissions from our daily lives.
He added that net zero is 'the only sensible goal' - and any targets to simply reduce emissions rather than eliminate them altogether wouldn't be enough.
He knows it won't be easy, but says he 'believes we can do it' because there's been some 'exciting' progress.
Gates said: "The cost of renewable energy from the sun and wind has dropped dramatically.
"There's more public support for taking big steps to avoid a climate disaster than ever before. And governments and companies around the world are setting ambitious goals for reducing emissions."
The three things he's convinced will get us to the bottom of the issue are:
In the excerpt, Gates also explained how he came to focus on climate change through the problem of energy poverty.
He writes: "In the early 2000s, when our foundation was just starting out, I began traveling to low-income countries in sub-Saharan Africa and South Asia so I could learn more about child mortality, HIV, and the other big problems we were working on. But my mind was not always on diseases.
"I would fly into major cities, look out the window, and think, Why is it so dark out there? Where are all the lights I'd see if this were New York, Paris, or Beijing?
"I learned that about a billion people didn't have reliable access to electricity and that half of them lived in sub-Saharan Africa. (The picture has improved a bit since then; today roughly 860 million people don't have electricity.)
"I began to think about how the world could make energy affordable and reliable for the poor.
"It didn't make sense for our foundation to take on this huge problem - we needed it to stay focused on its core mission - but I started kicking around ideas with some inventor friends of mine."
Gates said this eventually led him to conclude: "The world needs to provide more energy so the poorest can thrive, but we need to provide that energy without releasing any more greenhouse gases.
"Now the problem seemed even harder. It wasn't enough to deliver cheap, reliable energy for the poor. It also had to be clean."
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