On April 23, members of the Athabaskan tribe advocated for more regulation of black carbon in Canada. The group said reductions in black carbon, particulate matter from incomplete combustion of certain fuels and materials, would mitigate the effects of global warming in the Arctic. The group petitioned the Inter-American Commission on Human Rights, asking the body to declare that inaction by the Canadian government violates the 1984 American Declaration on the Rights and Duties of Man.