NEW DELHI, Dec 10 (Reuters) - India's plans to ramp up coal-powered steelmaking capacity could impede the country's goal of net-zero carbon emissions by 2070, Global Energy Monitor (GEM) said in a report on Tuesday. India's Prime Minister Narendra Modi has set 2070 as the target for achieving net zero emissions, two decades later than what scientists recommend to avoid catastrophic climate impacts. But a push to produce more steel to meet rising demand driven by India's rapid economic growth...