Trees are key players in regulating climate because they convert carbon dioxide, which they store in their trunks and roots, to oxygen.

CNN: Global warming threatens forests, study says

We depend on properly functioning ecosystems for our well being, including providing freshwater, regulating the climate and controlling pollination.

ECONOMIST: Letters

Blueprint for Ocean and Coastal Sustainability sounds the alarm about the health of the ocean, and explains how it influences our everyday life by regulating the climate, providing highly-nutritious food and by sustaining livelihoods and economies.

UNESCO: OFFICE IN BRASILIA

This is useful, she says, for purposes of stabilizing the climate, controlling floods, purifiying drinking water, regulating water flow, supplying bees and other pollinators that supply 20% of our food.

FORBES: Stanford Professor Uses Software To Value Nature