Buoyed by some initial exits, G2 now has even more money to work with.
The freely accessible Diamond List includes 75 promising early-stage climate startups for investors to peruse.
The startup's machine-vision technology makes sunshine a viable alternative for carbon-intensive tasks like manufacturing steel and cement.
Energy Vault's storage towers should reach customers later this year, according to the CEO.
Investors want a piece of the startups that could build a low-carbon society.