"Around the world, breathing a variety of air pollutants – in some cases for a single day – increases the chance that people will suffer heart attacks, according to a new analysis published Tuesday. For the first time, scientists analyzed previous studies from five continents to verify and quantify the links between air pollution and heart health. They found that short-term exposure – less than seven days – to all major air pollutants except ozone was associated with an increase in heart attacks.

"Mexico's oil regulator is sounding an alarm over plans by the country's state oil monopoly to drill two ultra-deep-water wells near U.S. waters this year, saying neither the company nor his commission is prepared to handle a serious accident or oil spill there.

"One young child in four around the world is too malnourished to grow properly, a major new investigation reveals."

Residents of Oregon's Triangle Lake area complain that aerial spraying of herbicides, which drift onto adjacent properties, is causing harm to their health and plants. The herbicides involved are atrazine and 2,4-D. For years, state regulators dismissed the complaints, but now neighbors have banded together and hired labs to do their own testing.

"Although both Obama and DOE Secretary Steven Chu have said overhauling federal appliance efficiency standards and building codes is a critical priority, over the last year, progress has ground nearly to a halt."

TransCanada Corp, the backer of the Keystone XL pipeline project, on Tuesday again pushed back its already delayed schedule for building the pipeline. That may signal that the company believes current GOP gymnastics in Congress, trying to force the pipeline to be built, will have little effect -- but that conditions will be more favorable after the 2012 election.

"The United States should stop exports of natural gas to prevent domestic prices from rising, Democratic Congressman Edward Markey said on Tuesday while introducing two bills in the House of Representatives to prevent shipments.

The bills, which would face an uphill battle in the Republican-controlled House, come as U.S. regulators consider applications for exports of a glut of natural gas that has weighed down prices and caused some companies to step back from drilling.

"Since January, baby bottles, sippy cups and reusable food containers in Maine have been free of the chemical hardening agent Bisphenol-A. Now, environmental health activists want the state to eliminate BPA from infant formula, baby and toddler foods. The move comes after tests conducted by The Alliance for a Clean and Healthy Maine and Mainely Moms and Dads also found BPA in those products."

"Libertarian thinktank keeps prominent sceptics on its payroll and relies on millions in funding from carbon industry, papers suggest."