Sunlit zone is depth of water exposed to sunlight, trenches is a long narrow ditch.
Climate change can worsen the intensity of tropical storms (such as hurricanes, typhoons and cyclones) in several ways, including by making record rainfall more likely and by causing sea levels to rise, which can raise the risk of storm surges.
Positive becaus Mexico city is right
Air pollution is the answer. The substances in the air could be pollutants which can harm your airways which can be really harmful to an asthmatic. I personally know because i have asthma myself.
Hope I hepled :)