The writer's general attitude towards the world leaders meeting at the UN is

A．As the UN hesitates, the poor take action.
B．Progress in environmental protection has been made since the Rio Summit.
C．Climate changes can no longer be neglected.
D．The decline of earth's life-support systems has been halted.

A．forest damage caused by pollution.
B．moving population from forest to cities.
C．the threat of climate change.
D．cutting large areas of trees.