co2

With sunlight, water, and CO2 from the air, organisms like plants make… well, they make themselves.

There's now more CO2 in our atmosphere than there has been at any time in the last 3 million years.

In this second half of photosynthesis, that CO2 goes through the Calvin Cycle, or the light-independent reactions.

While your lungs are working on oxygen and CO2, another system is trying to balance other stuff—sugars, proteins, fats, vitamins and more.

At that point, emissions from powering all that air conditioning could be as high as 2 billion tonnes of CO2 a year, about the same as India produces now.