An article in London's The Guardian reports on a warning by hundreds of scientists last week that a majority of the world's population, including in developed countries like the United States, is reaching a tipping point where easy access to fresh, clean water will no longer be easily available. They cite climate change, pollution and over-use of resources.

A July 3 posting to the CBS News website, originally from the Associated Press, begins:

"(AP) WASHINGTON - If you want a glimpse of some of the worst of global warming, scientists suggest taking a look at U.S. weather in recent weeks.

Horrendous wildfires. Oppressive heat waves. Devastating droughts. Flooding from giant deluges. And a powerful freak wind storm called a derecho.