On June 30, 2007, Hawaii Governor Linda Lingle signed into law Act 234, the Global Warming Solutions Act of 2007, which mandates that statewide greenhouse gas emissions be reduced to 1990 levels by 2020. The Act establishes a greenhouse gas emissions reduction task force. Before December 1, 2009, the task force must prepare a work plan and regulatory mechanism for implementing the maximum practically and technically feasible and cost-effective reductions in greenhouse gas emissions to meet the statewide limit set out in Act 234.
Act 234 [1]
Map of States with Greenhouse Gas Emissions Targets [2]
Links:
[1] http://www.capitol.hawaii.gov/sessioncurrent/bills/HB226_CD1_.htm
[2] http://www.pewclimate.org/what_s_being_done/in_the_states/emissionstargets_map.cfm