Associated Press: Thirty-one of the country's top science organizations are telling Congress that global warming is a real problem and something needs to be done about it.
The groups, which represent millions of scientists, sent the letter Tuesday, saying the severity of climate change is increasing and will worsen faster in coming decades.
Eighteen groups sent a similar letter in 2009. But Rush Holt, chief executive officer of the American Association for the Advancement of Science, said the climate problem...