LONDON (Reuters) - Royal Dutch Shell on Thursday deepened its ambition to battle climate change, setting the oil and gas sector's broadest plan to reduce greenhouse gas emissions to net zero by 2050.The new climate goals come as Shell and its peers face the sector's biggest crises in decades after oil prices collapsed and global demand for energy cratered due to coronavirus, leading companies to sharply cut their spending plans.The emission ambitions put the Anglo-Dutch company - at least on..