In just the past 10 years, energy breakthroughs have lowered the global forecast for emissions in 2040 by 40%. This year’s list of 10 Climate Tech Companies to Watch shows just a few of the many examples. In others, like agriculture and manufacturing, we’ve made much less. For example, sustainable aviation fuel now costs more than twice as much as conventional jet fuel, so it has a Green Premium of over 100%. Solar and wind power have grown quickly because in many cases they’re cheaper than conventional sources of electricity—that is, they have a negative Green Premium.