Great lakes reach highest levels of freeze since 1994

NASA`s Aqua satellite has shown the mostly frozen state of the Great Lakes on Feb. 19. On that date, ice spanned 80.3 percent of the lakes, according to NOAA`s Great Lakes Environmental Research Laboratory in Ann Arbor, Michigan.

Human impact on Great Lakes mapped

A comprehensive map shows that how human activities have degraded the North America`s Great Lakes that hold 20 percent of the world`s fresh water.