Chris Stark, chief executive of the Committee on Climate Change (CCC), which advises the government on its climate policy, told Sky News there was no easy path to eliminate Britain's carbon emissions if carbon capture - a technology which is still untested at scale - did not succeed. These comments come at a critical time, amid concerns that the UK is moving too slow to flesh out its full plans to get to net zero, even as it prepares to host the seminal COP26 climate talks in Glasgow next month. Said talks will be attended by a majority of world leaders, including US President Joseph Biden, French President Emmanuel Macron and Canadian Prime Minister Justin Trudeau. There are fears that the chances of meaningful success at the summit are slipping, with China's President Xi Jinping unlikely to come and many countries late in submitting their climate targets. While it is rarely discussed in the mainstream, carbon capture is at the very centre of these ambitions. Carbon capture aims to take the emissions from fossil fuel power plants or industrial processes like steel or cement production and to remove the carbon dioxide before it enters the atmosphere. The CO2 is then stored under the ground or used elsewhere, but the net result is to reduce or even eliminate the atmospheric impact of some of the economy's most important industrial processes. Mr Stark said that the CCC, which is responsible for mapping out the UK's policy options for meeting its goal of net zero carbon emissions by 2050, had attempted to plot a course to that target without carbon capture, but none of its pathways succeeded without it. "We published five different scenarios for getting to net zero," he said. "Each of them did include carbon capture to varying degrees. We did have a scenario without it. "But interestingly, it didn't quite get there, and you needed all the best of all the other scenario to be in place if you want to get close to net zero without carbon capture."