By Kate Abnett BRUSSELS (Reuters) -A European Union plan to label investments in natural gas and nuclear power plants as climate-friendly will be put to a final vote on Wednesday when lawmakers decide whether to accept or reject proposals that have divided governments and investors. The vote is the final hurdle in the EU’s long-delayed decision on whether to add the two energy sources to its “taxonomy”, a rulebook determining which investments can be marketed in Europe as sustainable. Designed to guide private capital towards truly green projects, the rules aim to set a European standard for s…