LONDON (Reuters) – More than 2 billion people have gained access to better drinking water sources, such as piped supplies and protected wells, between 1990 and 2010, U.N. officials said on Tuesday. The figure means the world has met the internationally agreed Millennium Development Goal (MDG) to halve the proportion of people with no safe drinking water well ahead of a 2015 deadline, UNICEF and the World Health Organisation (WHO) said. United Nations Secretary-General Ban Ki-moon said this was “a great achievement for the people of the world” and noted it was one of the first MDGs to be met. …