Activists from environmental group Greenpeace observe one minute of silence after placing 100 crosses at the Cenotaph memorial in central Hong Kong. The climate change conference held in the Danish capital ended last week with a non-binding agreement that the European Union has blasted as a Sino-US stitch-up which will do little to curtail global warming.(AFP/File/Antony Dickson)AFP - Disappointment at the outcome of a United Nations-sponsored climate change conference in Copenhagen is “justified,” US President Barack Obama said in a US television interview on Wednesday.