On the other hand, less stringent near term emissions reductions would, for a given stabilization level, require more stringent emissions reductions later on.

The act requires more stringent emissions testing for vehicles in these areas.

Rhodium 2001's extraction process is notable for being environmentally friendly, requiring no smelter nor airborne emissions, and for being a closely guarded secret.

Regulations being considered by the Federal Environmental Protection Agency would require emissions testing at a variety of engine speeds for vehicles in cities that have the worst air pollution.

In 2003, standards for light-duty vehicles were tightened to require 11.5% lower vehicle emissions than the most stringent American EPA (Environmental Protection Agency) recommended standards.

However, some local short tracks which run under NASCAR sanction require certain emissions control devices.

This alternative would also require new emissions- and noise-reducing technology on all snowmobiles entering the parks.

Analysis suggests that meeting the 2 C target would require annual global emissions of greenhouse gases to peak before the year 2020, and decline significantly thereafter, with emissions in 2050 reduced by 30-50% compared to 1990 levels.

It has long been recognized in a general sense that stabilizing carbon dioxide concentrations would require cutting emissions, and the Rio target has been widely considered a first step only.

But if the states can group together and require higher emissions controls, then Detroit won't have any choice.