Humans increase greenhouse gasses by burning fossil fuels or adding carbon dioxide to the atmosphere. This includes deforestation, combustion of fossil fuels, and biomass decay from agriculture. <span />
Water<span> boils when the molecules are able to overcome the vapor </span>pressure<span> of the surrounding air to move from the liquid phase to the gas phase.</span>

They are further classified into: fish, amphibians, birds, reptiles and mammals.
I hope I've helped : )
I kinda remember it and I think it's 60%