> The fact is that CO2 is not a pollutant. CO2 is a colorless and odorless gas, exhaled at high concentrations by each of us, and a key component of the biosphere's life cycle. Plants do so much better with more CO2 that greenhouse operators often increase the CO2 concentrations by factors of three or four to get better growth.
Yes, and ozone is a poison, but in the high atmosphere it still protects you from skin cancer. This arguments seems calculated to appeal to the most scientifically ignorant of audiences.
> This is no surprise since plants and animals evolved when CO2 concentrations were about 10 times larger than they are today.
Yes, because evolution happened at a single point in the past, and no evolution at all happened in the many millions of years since CO2 concentrations dropped below that level.
Yes, and ozone is a poison, but in the high atmosphere it still protects you from skin cancer. This arguments seems calculated to appeal to the most scientifically ignorant of audiences.
> This is no surprise since plants and animals evolved when CO2 concentrations were about 10 times larger than they are today.
Yes, because evolution happened at a single point in the past, and no evolution at all happened in the many millions of years since CO2 concentrations dropped below that level.