It's not just global warming, deforestation, pollution of the seas, etc. - a study published in the scientific journal Nature finds human activity is also responsible for rising global humidity from 1973-2002.
From AP:
Humidity increased over most of the globe, including the eastern United States, said study co-author Katharine Willett, a climate researcher at Yale University [...]
The finding isn't surprising to climate scientists. Physics dictates that warmer air can hold more moisture. But [the] study shows that the increase in humidity already is significant and can be attributed to gas emissions from the burning of fossil fuels.
