Campaigners have argued that rules protecting National Parks from fracking could be bypassed due to a "giant loophole".
The Government has said fracking in national parks, areas of outstanding natural beauty (AONBs) and the Broads should be refused other than in "exceptional circumstances and in the public interest".
But environmentalists warned that as ministers have indicated that developing shale gas and oil resources is in the interests of the country, the rules could allow fracking in protected areas.
Official guidance states that if proposed development for shale oil or gas would lead to substantial harm or to loss of a World Heritage Site, planners should refuse consent "unless wholly exceptional circumstances apply".
Greenpeace UK energy campaigner Simon Clydesdale said: "By introducing an exception under a vague 'public interest' case, they've created a giant loophole that could allow fracking all over these protected areas, potentially causing serious environmental damage to our unique natural heritage."
More top news
Theresa May is considering options to secure statutory powers for child sex abuse inquiry but it may require 'disbanding' current panel.
London mayor Boris Johnson is backing Olympics supremo Seb Coe as his replacement.
A top Fifa official who assessed rival bids to stage the 2018 and 2022 World Cups revealed England’s was by far the strongest contender.