We know if levels drop much below around 180ppm, plants have a hard time. Claiming we need more than the current 400ish is based on about as much as claiming we need less. Since we haven't exactly nailed down what caused catastrophic climate change around the end of the last ice age, or what puts us into ice ages... we should strive for stability, conservation of limited natural resources, and making our society resilient to the recurrence of known past massive climate swings and disasters. Right now, one decent volcano that ends a growing season worldwide, will kill most people on Earth. A large CME that takes out the grid worldwide for a few months, will do the same.

They claim that us others are the ones not listening to and ignoring evidence. There is no getting through to them, because they're essentially religious faith/belief-based extremists. Data and evidence won't change that type of person's stance. The only thing that will get through is when events start to shatter their programmed world view. Unless they win and take the whole world into some type of technocratic enslaved dark-ages.

Agreed, Flannery told us decades ago that rain would evaporate before it hits the ground, our dams would be empty, we wouldn't know what snow is, and desal, plants are our only option. And now with QLSND and NSW being flooded out, they are now spinning more extreme weather. Total arseholes that spin anything to keep the money flowing in, (that goes for the jab as well).