Weather itself is changing in the lush cloud because of deforestation many miles away, scientists say in a new study being published Friday in the journal Science. The changes threaten diverse plant and animal communities as well as assumptions behind an effort to save the world's best remaining rainforests. Up to now, the changes have been blamed on El Nino or global warming But the latest findings indicate that as trees on Costa Rican coastal plains are removed and replaced by farms, roads and settlements, less moisture evaporates from soil and plants. In turn reducing clouds around forested peaks 65 miles away.