He could commit to limiting the growth of domestic and defense spending.
Trump has also suggested he would not commit to limiting ground forces in Iraq or Syria.
France's government seems unwilling to commit to limiting its stake to 9% of the new company.
Greg Combet, Australia's climate change and energy efficiency minister, said the country would "commit to limiting its greenhouse gas emissions from 2013 to 2020 with a Kyoto target consistent with the bipartisan target of reducing emissions to 5% below 2000 levels by 2020".
Politico, which dispatched reporters to nearly a dozen town-hall meetings, reported, for example, that the Colorado representative Mike Coffman, a relative moderate, was confronted by a lifelong Republican who demanded that he commit to limiting premiums for people with preëxisting conditions.
In 2011, a report by the International Energy Agency found that solar energy technologies such as photovoltaics, solar hot water and concentrated solar power could provide a third of the world's energy by 2060 if politicians commit to limiting climate change.
A large number of the world's biggest energy companies endorse a global climate agreement that would commit to limiting temperature rise to 2 degrees Celsius, according to a survey released Wednesday.
If you think you may be in the same boat, become a teetotaler for a 30 days, or commit to limiting alcohol in specific ways, such as only drinking one night per week, and setting a max of two drinks.
World leaders agreed in Paris last December to commit to limiting greenhouse-gas emissions in an effort to stabilize rising temperatures, while the World Meteorological Organization WMOO) said in July the earth was warming faster than expected and on track for its hottest year ever.
