The four classes of extremes -- high heat, heavy precipitation and floods, duration and intensity of droughts and extremes related to higher sea levels -- have changed in the last 50 years, Field said.

CNN: Extreme weather: Get ready to see more of it, scientists say

An assessment of the impacts of climatic change in Latin America and the Caribbean supported by reliable data suggests that ??climate changes during the last century have included an increase in the surface medium temperature, particularly in medium and high latitudes, and changes in precipitation quantity and intensity in several countries of the Region (Southern Brazil, Paraguay, and Argentina).

UNESCO: Climatic Change

Climate change is changing precipitation patterns and intensity, increasing the incidence of droughts, floods, and erosion.

FORBES: Water Risk Threatens Businesses, National Security