Before the Ice age, about 50 million years ago, temperatures were much higher than they are today, the whole globe enjoyed a tropical climate. At that time forests of large deciduous (e. g. the needle-leaved dawn redwood or the broad-leaved ginkgo) grow near the North Pole. Why did they shed their leaves in the winter

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