Each year the Microsoft founder and his wife Melinda publish a letter that outlines the areas that cheer, worry and surprise them. The topics in the letter are taken from the couple's experiences trotting the globe to combat poverty, disease and other problems.
BEV is looking to invest in startups and research that tackle five areas, which he calls "grand challenges." These are agriculture, buildings, electricity, manufacturing and transportation.
But he says there are two areas that account for 21% and 24% of worldwide greenhouse emissions, respectively, that are sorely ignored: manufacturing of building materials and agriculture.
Making building materials like steel and cement requires a lot of fossil fuels and processes that belch out carbon, he says.
The world is currently on track to double its buildings by 2060 which Gates points out is like building "an entire New York City every month for 40 years."
"We need to find a way to make it all without worsening climate change," he says.
Agriculture is another gas-producing culprit. Despite the healthy, pastoral image of cows grazing on green rolling hills, Gates notes that cattle "give off methane when they belch and pass gas. (A personal surprise for me: I never thought Id be writing seriously about bovine flatulence.)"
He's not advocating that cattle farming be banned, nor is he saying that we end construction or transportation. He just wants the world to focus more on solutions to all the areas hurting the climate.
"Solar panels are great, but we should be hearing about trucks, cement, and cow farts too," he says.
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