By Simon Jessop LONDON (Reuters) – British bank Natwest cut lending to clients in the oil and gas sector by 21% in 2021 and aims to limit it further as part of efforts to decarbonise its loan book and reach net-zero emissions, it said on Friday. Financial firms around the world are increasingly committing to the net-zero target as part of efforts to contain global warming, although most have yet to put firm plans in place, particularly over the shorter-term. The figures were announced in the first update by Natwest since it warned in 2020 it planned to cut off financing for larger oil and gas …