Germany is nearly halfway to replacing fossil fuels and nuclear power, other countries are even further along (though they are smaller). Pretty sure they qualif

Germany is nearly halfway to replacing fossil fuels and nuclear power, other countries are even further along (though they are smaller). Pretty sure they qualify as a modern human civilizations. I've heard nonsense claims against renewable energy my entire life, but it's all over except for the shouting. Nuclear is going away because wind and solar are already cheaper and easier to deploy and better for the environment. Maybe it's a good option on Mars where there isn't a biosphere. If you were on a spaceship and every year the CO2 => oxygen recycling systems grew increasingly unpredictable as well as the average temperature of all systems onboard, would it be alarmist to figure out what was going on? The climate is changing, very slowly on our individual lifespan timescale, but very quickly on the timescale of the last twenty thousand years of weather patterns that can support our current population.