We must start to treat climate change as what it is - a threat to United States security. And we must not delay.

The effects of climate change are well-documented and clearly visible in Glacier National Park and yet the United States refuses to fulfil its obligations under the World Heritage Convention to reduce greenhouse gas emissions.

The lagging performance of the United States on environmental issues -- particularly on energy and climate change -- signals trouble not only for the American people, but for the whole world. Perhaps this ranking will serve as a wake-up call to the American public and particularly to leaders in Washington.

is being driven by the realities of federal funding and the political climate in the United States.

The very fact that this kind of climate can exist in the capital of the United States is unacceptable.

Jackson's trip stands at the cusp of major change in the United States for transportation, ... To a great extent, he was still traveling through a 19th-century America that hadn't changed much since the 1860s or so.