Which reaction is exothermic? a reaction that absorbs energy from the environment
a reaction that requires an activation energy
a reaction that releases energy into the environment
a reaction that does not involve a change in energy

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit