Final answer:
True. Even if greenhouse gas emissions by humans were reduced to zero, the Earth is still projected to keep warming due to the greenhouse gases already present in the atmosphere.
Step-by-step explanation:
True. Even if greenhouse gas emissions by humans were reduced to zero, the Earth is still projected to keep warming for the foreseeable future due to the greenhouse gases already present in the atmosphere. These gases, such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), have long atmospheric lifetimes and continue to trap heat, leading to increasing temperatures over time. The warming is expected to be greater over land than over the ocean and greater in the Arctic than anywhere else on Earth.