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  • A family swims in Lake Nicaragua, which will encompass nearly half of the proposed canal's 172-mile route. Environmentalists worry that oil spills, pollution and dredging will destroy the country's largest supply of fresh water.
    A Chinese Man, A $50 Billion Plan And A Canal To Reshape Nicaragua
    Groundbreaking for the 173-mile canal is set for December, but critics warn the waterway will cause irreparable environmental and social damage. The government has withheld outside firms' assessments.
  • Earth has been many different planets in its long history — and could be more. Some imaginary views are shown here. Top (from left): a water world before large-scale continents had formed; a "snowball" Earth phase with extreme glaciation; and a world shrouded in smoke after a large asteroid impact. Bottom: Earth today; Earth losing its oceans as the sun becomes hotter; and a final scorched Earth.
    Humanity's Coming Of Age On Planet Earth
    Some of the five mass extinctions Earth experienced in the past were driven by climate changes. Future Earth will be just fine. It's us humans we need to worry about, says astrophysicist Adam Frank.
  • Cosmic Rays Sound Scary, But Radiation Risk On A Flight Is Small
    Pilots and flight attendants in some countries are classified as "radiation workers" because of their extra exposure to cosmic rays. Scientists say these frequent fliers may face greater risks.
  • Piles of coal are shown at NRG Energy's W.A. Parish Electric Generating Station in Thompsons, Texas. The U.S. Environmental Protection Agency will begin regulating mercury emissions from coal-fired power plants for the first time.
    EPA To Unveil Stricter Rules For Power Plants
    The rules, which come two decades after Congress ordered the agency to regulate toxic air pollution, would give power plants nationwide just three more years to slash mercury and other harmful emissions. But some big power plants are angling for more time.
  • In some parts of the country, like San Diego (above), gas prices are above $4 a gallon. Some Republicans are trying to tie those higher prices at the pump to President Obama's energy policies.
    Revving Up For 2012, GOP Hits Obama On Gas Prices
    High oil and gas prices are emerging as a big issue in the 2012 presidential campaign. Oil market analysts say recent price hikes have more to do with turmoil in the Middle East than with administration policies. Still, potential Republican candidates are trying to draw a direct line between high gas prices and President Obama.
  • Huge tanks help house the oil surplus in Cushing, Okla. Each tank holds more than 250,000 barrels of oil.
    Canadian Oil Bottleneck Means Cheaper Gas For Some
    Canada ships about 2.5 million barrels of oil to the U.S. every day, much of which comes through a pipeline system that dead-ends in Cushing, Okla., a town where incoming oil supplies have backed up enough to keep oil prices in the middle of the country lower than on the coasts.
  • In some parts of the country, like San Diego (above), gas prices are above $4 a gallon. Some Republicans are trying to tie those higher prices at the pump to President Obama's energy policies.
    Revving Up For 2012, GOP Hits Obama On Gas Prices
    High oil and gas prices are emerging as a big issue in the 2012 presidential campaign. Oil market analysts say recent price hikes have more to do with turmoil in the Middle East than with administration policies. Still, potential Republican candidates are trying to draw a direct line between high gas prices and President Obama.
  • The planned Keystone XL pipeline, if approved, would connect to the Keystone Steele City pumping station in Nebraska, seen here in 2015.
    TransCanada Submits New Application To Build Keystone XL Pipeline
    The pipeline would transport crude oil from Alberta to Nebraska. President Obama blocked it. President Trump told the company to refile for a permit and promised to speed the approval process.
  • Scientists map world's largest known deep-sea coral habitat
    NPR's Scott Detrow talks with Temple University biology professor Erik Cordes about the discovery of the world's largest known deep-sea coral habitat.
  • Morning news brief
    Donald Trump wins New Hampshire's GOP primary, and presidential candidates will focus next on Nevada and South Carolina. Thousands of workers in Argentina plan to strike to protest economic reforms.
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