reporter: this is lorne stockman, who heads the research at oil change international, a climate advocacyp. lorne: they're locked into this kind of fantasy that their fossil fuel is the one that is okay and can grow and still has room for growth. d that the others will, you know, carry the burden of getting us to our emissions goals. and there's really not a credible climate scenario in which gas can grow. reporter: but that really begs the question -- if we need to use less gas, what should we use instead? well, most importantly, we should tap cleaner energy sources, like wind and solar. which are, by and large, also cheaper. however we do it, we need to cross the gas bridge. sooner rather than later. because that's the thing with bridges -- they have a beginning and an end. ♪ >> two children. two continents. one giant problem. [speaking foreign language] >> how will climate change affect us and our children? learn more at dw.com/water. reporter: most people need a job to be able to afford a roof over their head, to buy food, and to take part in social activities. but millions don't have

reporter: this is lorne stockman, who heads the research at oil change international, a climate advocacy group. lorne: they're locked into this kind of fantasy that their fossil fuel is the one that is okay and can grow and still has room for growth. and that the others will, you know, carry the burden of getting us to our emissions goals. and there's really not a credible climate scenario in which gas can grow. reporter: but that really begs the question -- if we need to use less gas, what should we use instead? well, most importantly, we should tap cleaner energy sources, like wind and solar. which are, by and large, also cheaper. however we do it, we need to cross the gas bridge. sooner rather than later. because that's the thing with bridges -- they have a beginning and an end. ♪ >> two children. two continents. one giant problem. [speaking foreign language] >> how will climate change affect us and our children? learn more at dw.com/water. reporter: most people need a job to be able to afford a roof over their head, to buy food, and to take part in social activities. but millions don