Topic: Niagara Falls

World reacts cautiously to Ahmadinejad's re-election

Tapping the energy potential in our backyards

Earth Talk: Biomass has significant ecofriendly potential for power and heat, experts say.

Environmentalists send their wish list to Obama

Twenty-eight green groups compile 359 pages of suggestions, hoping for a green revival post-Bush.

More Mail Bag matches

Readers remember the friendships they formed through the Monitor's old pen-pal column.

Controversial path to possible glut of natural gas

Water and chemicals injected at high pressure can extract more gas – and possibly pollute drinking water.

More Mail Bag matches

Readers remember the pen pals they found through the Monitor's old Mail Bag column.

Battling California fires, inmates find a chance at better role

About 2,500 trained inmate firefighters are providing vital help in the wildfire crisis.

How Arctic flow can snowball

On the horizon: news from the frontiers of science

Walden Pond and global warming, truckers don their skirts, and how Arctic flow can snowball.

Igauzú Falls – a roar to remember

Its 275 waterfalls – spanning the Argentina-Brazil border – create a raging rush as water plummets more than 200 feet off cliffs.