You are given a sentence and your task is to generate another sentence that supports the given input.

Example input: In spite of this reduced heat input, the surface temperature of Venus is higher than that of the Earth.
Example output: Venus has a warmer average surface temperature than earth.
Example explanation: Output statement supports the input statement's claim about the temperatures of Venus being higher than the earth.
Q: Within the past 200 years or so, increased amounts of carbon dioxide and other greenhouse gases have been released into the atmosphere due to human activity.
A:
The composition of the atmosphere has changed over the last 200 years primarily due to human activity.