20 The Gulf stream transports large amounts of heat from the tropics to middle and high latitudes, and thereby affects weather phenomena such as cyclogenesis and low cloud formation.
So in temperate climates, fewer mosquitoes end up carrying the infectious form of the parasite than in the tropics, and, as a result, eradicating malaria has just been easier to do in temperate places.
It may be that tropical birds, which face more intense competition for food and nesting sites than temperate ones do because the tropics have more species, form more stable and collaborative pair-bonds than do temperate birds.
She had not yielded for an instant to the enervating charm of the tropics, but contrariwise was more active, more worldly, more decided than anyone in a temperate clime would have thought it possible to be.