“We’ve put all the effort into the easy categories of cars and power generation.
“In the hard categories, the work has barely, barely begun.
“You don’t get success unless you cover them all.”
Mr Gates elaborates on this argument in chapter 10 of his new book, ‘How to Avoid a Climate Disaster: The Solutions We Have and the Breakthroughs We Need’.
Last Month, Mr Gates threw his support behind plans to reduce global warming using chalk.
The project would see a large balloon containing chalk being released near the Arctic town of Kiruna.
The balloon could be used to sprinkle calcium carbonate, or chalk dust, which could potentially deviate some of the sun’s energy, decreasing Earth’s temperatures.
As well as voicing his support, Mr Gates was one of the private donors who contributed to making the plans possible.