But it has taken on new urgency,coming one day after the World Health Organization raised its global swine flu alert to Phase 4 on the six-point scale.

VOA: standard.2009.04.28

The first phase of the Kyoto Protocol expires in 2012 and the current talks are aimed at setting in place new legally binding emissions targets for the decade to come.

VOA: standard.2009.11.04

The last phase of the new missile defense plan, to be ready by 2020, would be to develop interceptors with the capability of blocking long-range Iranian missiles aimed at the United States.

VOA: standard.2009.09.17

Preliminary phase one tests of this new type of flu vaccine have already started in humans, but in an interview, Nabel said that even if all goes well, it will still be years before a universal flu vaccine is widely available.

VOA: standard.2010.07.21