LONDON (Reuters) – Britain called on other nations on Monday to do more to deliver on an agreement struck last year at U.N. climate talks, with COP26 president Alok Sharma saying this year was the “time to honour our promises”. Sharma, the British lawmaker who presided over last year’s climate talks, said he would focus on members of the Group of 20 nations to do more to tackle climate change but also would try spur efforts to hand finance to more vulnerable countries. It is early days since the deal was agreed in Glasgow, but already some countries are struggling to find ways to deliver on th…