Dams on the Salween River could damage ecosystems, displace people and lead to potentially catastrophic seismic events, warn environmental groups.
Environmental groups have praised US President Barack Obama's move to limit uranium mining near one of the world's natural wonders, the Grand Canyon.
Environmental groups have hailed a ban on new mining claims around the Grand Canyon, saying it will secure Barack Obama's green legacy.
A rafting trip down the Colorado River provides private and awesome views of one of the world's natural wonders. Elisabeth Hyde reports.