article_snippet.sent: A recent Nasa map shows is produces more than triple the standard ground-based estimate - and researchers say researchers don't know why.. Scroll down for video .
article_snippet.sent: This is almost 3.5 times the estimate for the same area in the European Union's widely used Emissions Database for Global Atmospheric Research.
article_snippet.sent: The results are indicative that emissions from established fossil fuel harvesting techniques are greater than inventoried,' Eric Kort said. '
article_snippet.sent: Satellite data cannot be as accurate as ground-based estimates, but from space, there are no hiding places,' Frankenberg said.