Two US senators went public with this proposal to cut short-lived climate pollutants (SLCPs) which are currently responsible for 40 per cent or more of global warming. Introducing the Super Pollutants Act of 2014, senators Chris Murphy (Democrat, Connecticut) and Susan Collins (Republican, Maine) have called for establishing a task force to review specific policies and laws to reduce black carbon, methane, and high-global warming potential (GWP) hydrofluorocarbons (HFCs).