By 2045, Pune, Surat, Jaipur, Bangalore and Ahmedabad would have joined the ranks of cities showing such climate departure, which means even the monthly dips in temperatures would be hotter than that experienced in 150 years (ending 2005), states the paper published in Nature on Wednesday.

The study, a massive new analysis of all climate models, says most cities around the world would have reached their climate tipping points by 2047 if no new steps to contain carbon dioxide emission are initiated.

(Read the full report here)

The paper carries predictions for 10 Indian cities, saying Mumbai and Chennai will be the first to reach the 'point of no return' — as early as 2034 — in the "business as usual" scenario wherein the world makes no special efforts to cut emissions.