Which statement about the earth’s atmosphere is true? Please help

A. A recent increase in carbon dioxide levels can contribute to a long-term cooling of Earth’s climate.

B. A recent decrease in carbon dioxide levels will increase plant growth on Earth.

C. In the past few decades, carbon dioxide levels have been rising.

D. In the past few decades, carbon dioxide levels have been falling.

:)

Which plate boundary causes plates to collide forming mountain ranges, volcanoes, and island arcs? give an example of this type of plate boundary. 2. at which plate boundary do rifts and mid-oceans ridges form? give an example of this type of plate boundary. 3. at which plate boundary do plates slide past each other while moving in opposite directions? give an example of this type of boundary.