The claim is made here:
Tens of millions of pounds of UK aid money have been spent on a programme that has forcibly sterilised Indian women and men [...]
Yet a working paper published by the UK's Department for International Development in 2010 cited the need to fight climate change as one of the key reasons for pressing ahead with such programmes.
Googling has only turned up the Guardian article and no further original sources (all other sources just block-quote the Guardian article)