Three U.S. presidential wannabes refuse to accept fossil-fuel funding

The climate-justice group 350.org and the Nation magazine have launched a campaign to wean the next American president off political contributions from oil, gas, and coal companies.

They're calling on all candidates to refuse donations from the fossil-fuel sector.

So far, three of them—two Democrats and one Green Party candidate—have signed pledges to do this.

• Martin O'Malley (Democrat) is the former two-term governor of Maryland and former mayor of Baltimore. His website includes a five-point plan to promote renewable energy, including ending fossil-fuel subsidies and providing tax credits for wind and solar power. He's also keen to promote biofuels by directing the Environmental Protection Agency to set annual volume targets.

• Bernie Saunders (Democrat) is a senator representing Vermont and former mayor of the state's biggest city, Burlington. He's called for a tax on carbon and methane emissions and opposes the proposed Keystone XL pipeline. His website states that he "secured $3.2 billion in the economic stimulus package to fund grants to reduce greenhouse gas emissions". It led to "upgrades for more than 86,000 buildings and installed more than 9,500 solar energy systems".

• Jill Stein (Green) is a doctor and environmental-health advocate who ran as the Green candidate for president in 2012. Her website calls for the United States to be 100 percent reliant on clean, renewable energy by 2030. "Lead on a global treaty to halt climate change," it states. "End destructive energy extraction: fracking, tar sands, offshore drilling, oil trains, mountaintop removal, and uranium mines."

Anyone who wants to tell presidential candidates to refuse fossil-fuel money is being encouraged to click here.

One candidate who appears to be utterly unconcerned about global warming is Donald Trump, who's seeking the Republican presidential nomination. (Of course, he's not the only denier in his party.)