Comment by tbrockman

Even granting your numbers, you're measuring the wrong thing. Wilderness acreage and emissions trends are not ecosystem health.

Citing a wilderness figure for developed countries is misleading. Most of it is ecologically vacant--second-growth and tree plantations sans apex predators, large herbivores, intact soil biota, etc. Tree cover is not a functioning ecosystem. Developed countries have exported their ecological destruction: the beef, soy, palm oil, and minerals driving habitat loss in the tropics get consumed in the same places where the domestic "wilderness" figures look great.

The Living Planet Index (actual wild vertebrate populations) is down 73% on average since 1970. North American bird populations are down ~3 billion over the same period. Terrestrial insect biomass shows steep decline in studied regions. None of that shows up in "how much undeveloped land exists" or "how many solar panels got installed."

China's solar buildout is great news for climate, but climate is one driver among several. Habitat fragmentation, pollution, and overfishing don't get solved by the energy transition. You can decarbonize the entire grid and still preside over a mass extinction.