UN climate chief says they have helped to transform politics since Copenhagen crash.
Countries set a 2015 deadline to adopt a new treaty.
Provinces make the pledge at Rio conference on sustainable development.
TORONTO: Global producers of industrial products continue to be big contributors of greenhouse gases, according to a new PricewaterhouseCoopers report. The global consulting firm notes that the aerospace and defence, industrial manufacturing, chemicals, metals, and transportation and logistics sectors have…