As international ministers arrive in Paris for the final week of the COP21 conference to reach an agreement intended to define the future of human existence on the planet, the climate justice movement is stepping up its critique of the UN climate talks. Meanwhile, climate change deniers are holding a counter conference with the ambition of stopping an agreement, hosted by some of those named as the worst "climate criminals" at COP21 by global advocacy group Avaaz. VICE News talks to Kumi Naidoo, head of Greenpeace, to find out what influence the world’s biggest environmental NGO has over the UN talks, and attends a climate change deniers conference.