Which of the following is not a possible effect of rising carbon dioxide levels on plants?

Hi:)

I think those were the options for your question, tell me if I'm wrong!
increased photosynthesis (this is false, plants need carbon dioxide for photosynthesis), increased plant mortality (this is the correct answer)  increased crop productivity (this is also false, it is connected to photosynthesis) and increased plant growth (also false)

Explanation:

The air behind a cold front is colder and drier than the air in front. ... A warm weather front is defined as the changeover region where a warm air mass is replacing a cold air mass. Warm fronts usually move from southwest to northeast and the air behind a warm front is warmer and moister than the air ahead of it.