Anadarko Petroleum, Noble Energy, and Encana, to endorse Colorado governor John Hickenlooper's proposed tighter regulation of emissions of volatile organic compounds by oil and gas production. EDF has funded studies jointly with the petroleum industry on the environmental effects of natural gas production. The policy has been criticized by some environmentalists. EDF counsel and blogger Mark Brownstein answered: Demand for natural gas is not going away, and neither is hydraulic fracturing. We must be clear-eyed about this, and fight to protect public health and the environment from unacceptable impacts. We must also work hard to put policies in place that ensure that natural gas serves as an enabler of renewable power generation, not an impediment to it. We fear that those who oppose all natural gas production everywhere are, in effect, making it harder for the U.S. economy to wean itself from dirty coal. See also Sustainability Biodiversity Global warming Recycling Ecology Earth Science Natural environment Natural landscape Massachusetts v. Environmental Protection Agency References External links Environmental Defense Fund Fightglobalwarming.com (In partnership with the Ad Council) Environmental Defence Canada. environmentaldefence.ca YouTube channel Environmental organizations established in 1967 International environmental organizations Non-profit organizations based in New York City Environmental organizations based in New York City