In 2004, Challen presented a Ten Minute Rule Bill introducing the idea of David Fleming's TEQs scheme to Parliament, as a way of guaranteeing that promised emissions reductions would actually be achieved. In 2009, Challen tabled an early day motion calling for all internal UK flights to be phased out before the end of the year, in order to reduce greenhouse gases. He also urged Parliament to cut the national speed limit to 55 mph, and to dedicate two hours of prime-time television each week to explain the dangers posed by climate change.