Problem: Which of the following statements concerning atmospheric CO2 levels or greenhouse warming is FALSE?
Group of answer choices
- During the last part of the Mesozoic Era (the Cretaceous), atmospheric CO2 levels were much higher than they are at present.
- Greenhouse warming only occurs as a result of human activities, such as fossil fuel burning, industry, and deforestation.
- Greenhouse gases are ones that do not absorb most incoming solar radiation but do absorb outgoing terrestrial radiation.
- At present, atmospheric CO2 levels are higher than they have been at any time over the past three million years of Ice Ages.
- Natural ecosystems can handle slow changes more easily than fast ones, so the rate at which CO2 rises is a crucial factor.