25 Senators are asking the White House to spend more money on dredging harbors and channels -- a special problem in the Great Lakes, where near-record low water levels caused by drought and possibly climate change are costing shippers money.

"Injection wells used to dispose of the nation's most toxic waste are showing increasing signs of stress as regulatory oversight falls short and scientific assumptions prove flawed."

"The drought of 2012, which continues to spread westward, is making its mark on the national consciousness in many ways. Rising food prices. Interrupted livelihoods. Fields of stunted, desiccated crops. All of this dryness has resonance in our video culture. Just go to YouTube and look at the proliferation of public service announcements on water conservation."

"Arctic sea ice, a key indicator of climate change, melted to its lowest level on record this year before beginning its autumnal freeze, researchers at the U.S. National Snow and Ice Data Center said on Wednesday."

"BP shut a Norwegian oil and gas field after a potentially dangerous leak, the company said on Tuesday, six days after the incident forced the emergency shutdown of the facility."

"Sea surface temperatures (SSTs) off the East Coast from North Carolina to the Gulf of Maine were the hottest ever recorded for the first six months of 2012, according to NOAA's latest Ecosystem Advisory. Above-average temperatures were found everywhere: from the sea surface to the ocean bottom and out beyond the Gulf Stream."

"The governor declines to declare that one exists. Critics say it's all about business."

"Chlorine has long been the industry standard to keep pool water clean and clear, but consumer demand for alternatives has prompted the emergence of new technologies, including the saltwater systems that came into vogue a few years ago and the copper-and-silver ionization and ozone-gas systems that are increasingly popular."

"An environmental group asked the U.S. government on Thursday to consider classifying the orange clownfish -- Nemo, to a whole generation of children -- as endangered."

"The Portland City Council voted 5-0 during a raucous public meeting Wednesday morning to add fluoride to Portland's drinking water, ending the city's status as the only major U.S. city that hasn't approved fluoridation."

Oil and gas drilling can usually protect groundwater when enough effort is taken to install well casings and cement them properly. But even those safeguards may fail in karst formations, as the Bureau of Land Management's experience in New Mexico shows.

"The U.S. Navy can build a $100 million submarine training range off the coast of Southern Georgia and Northern Florida, a federal judge ruled Monday, dismissing a lawsuit by environmental groups claiming the project would harm the already endangered North Atlantic right whale."

"Canada and the United States have updated a decades-old agreement to protect the Great Lakes, adding new commitments to protect aquatic habitats, curb invasive species and help coastal communities adapt to climate change."

"Aging boomers pop more pills to keep fit. Farmers feed more antibiotics and hormones to fatten livestock. Adults and children use exotic shampoos and conditioners to make their hair shiny. Most of these drugs and personal-care chemicals wind up down the drain, into sewage, land-applied sludge, reclaimed water and ultimately the Indian River Lagoon, St. Johns River and other waters."

"PORTLAND, Ore. -- Who bears responsibility for an impoverished child with a mouth full of rotting teeth? Parents? Soda companies? The ingrained inequities of capitalism? Pick your villain, or champion. They are all on display here as the largest city in the nation with no commitment to fluoridating its water supply -- and one of the most politically liberal cultures anywhere -- has waded into a new debate about whether to change its ways and its water."