Which of the following explains how scientists know that current global warming is related to human activities? There wasn't carbon dioxide in the atmosphere in the past.
There was more methane in the atmosphere 6,000 years ago.
Increased carbon dioxide in the atmosphere is not carbon-14.
There is more water vapor in the atmosphere today than the past.

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.

D. pray lands grasslands swamps