UNITED NATIONS (AP) — U.S. climate envoy John Kerry on Tuesday urged the world to be “very skeptical†about claims from oil and gas producers that emerging technology soon will allow people to adequately capture the climate-wrecking fumes emitted by their cars, planes and businesses.

It’s “one big question mark,†Kerry told The Associated Press of the , a debate at the heart of global negotiations on cutting emissions to stave off the most disastrous scenarios of global warming.

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