Some scientist claim that humans are contributing to global warming by the?

Question

Some scientist claim that humans are contributing to global warming by the?

Answer 1

Burning of fossil fuels producing massive quantities of CO2 in the atmosphere.

Answer 2

actually by the increased land usage and passive heat radiation generated by the miles and miles of concrete and asphalt we have laid on the ground.

there is no profof that CO2 levels increase temperature, although we are responsible to the MINISCULE increase over the last 1000 years.