ClientEarth public interest Germany nature conservation new social movement activism nuclear energy cold war environmentalism Climate Change Act climate policy The Big Ask environmental NGOs policyentrepreneur environmental law Friends of the Earth social movement theory non-governmental organisations interest groups environmental politics France professionalisation NGO identity transnational environmentalism North–South Paris COP21 2015 summits climate change movement transnational social movements efficacy International NGOs environmentalism multiple Streams Framework authority Walmart indigenous environmentalist activism Cape York Wild Rivers James Price Point Strategy management environmental non-governmental organisations strategic environmental management analysis