A is a possible answer as it refers to an increase of temperature; this is what global warming is (the raise of earth’s temperature)
Answer:
It is found in ice/solid form, not liquid or gas
Explanation:
Scientists have yet to prove that the current global warming trend is not part of the natural cycle of Earth. Many things are being done now, mostly focusing on emission controls placed upon industry and transportation.
Answer:
It is both a barrier keeping unwanted things out, and a gate for nutrients to be brought in.
