President Obama is expected to soon add emission rules for big-rig trucks to a growing list of regulations to combat the threat of climate change.

The president directed the Environmental Protection Agency to develop new rules for heavy-duty trucks to make them more fuel efficient, while lowering their carbon dioxide emissions to lessen the effects of global warming.

Trucking manufacturers will be looking to see if they are able to meet the standards without driving smaller trucking fleets out of business, according to industry representatives.

The rules will not only regulate the truck and the engine, but are also expected to add new efficiency and emission regulations for trailers that large tractor-trailer trucks haul. One official says it will be a "big rule" that comprises so many components of large trucks that it could easily be broken down into several separate regulations.

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