The long term vision is agreed by relevant parties like the decision of the G8 in Heiligendamm 2007 or in Toyako 2008: Halving the global 1990 level of GHG emissions by 2050. But more of the interest is the discussion for intermediate targets for 2020. There the USA position is fixed by President Obama's commitment to seek legislation to reduce GHG emissions by 14% below 2005 levels by 2020, and approximately 83% below 2005 levels by 2050. This means: coming back to 1990 levels in 2020. The Waxman-Markey Bill (see Section 5.4) would go beyond this value.
Japan committed itself under the Kyoto Protocol to cutting emissions by 6% from 1990 levels in the 2008-2012 period, but has struggled to meet that goal. The 2020 target is equivalent to a cut of 8% below 1990 emission level.
The EU Climate Policy has the strong climate target of a 20% reduction in EU GHG emissions compared with 1990 levels, and if other developed nations agree to take similar actions a reduction of 30% was promised. The target also includes an increase in the use of renewable energy to 20% of all energy consumed and a 20% increase in energy efficiency.
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Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.