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Initiatives by topic
Miami Climate Alliance, network of organizations and individuals dedicated to creating people-centered solutions to climate change
Florida is a low per capita energy user. It is estimated that approximately 4% of energy in the state is generated through renewable resources. 
Florida Department of Environmental Protection - Florida Rivers and Watersheds – Florida DEP - Wikipedia: Restoration of the Everglades: Restoration of the Everglades has long been recognized as an environmental priority in the state. In 2000, Congress passed the Comprehensive Everglades Restoration Plan, a $7.8 billion, 30-year project aimed at preservation and restoration of the region and its unique combination of environments.  Though the plan was passed into law in 2000, it has been compromised by politics and funding problems.
Reduce, reuse, repair and recycle
The recycling rate in Florida is estimated at 28% in 2000. In 2008, The Energy, Climate Change, and Economic Security Act of 2008 set a goal of progressively improving recycling to reach a 75 percent rate by the year 2020.
It directs public entities (schools, state and local public agencies) to report the amount they recycle annually to their counties. Private businesses are encouraged (but not mandated) to report the amount they recycle to their counties. Finally, the section directs DEP to create the Recycling Business Assistance Center. Under the new law, each county must implement a recyclable materials recycling program that shall have a goal of recycling recyclable solid waste by 40 percent by December 31, 2012, 50 percent by 2014, 60 percent by 2016, 70 percent by 2018, and 75 percent by 2020. The county with the highest recycling rate is Lee County with a 43% recycling rate as of 2008. 
Building Community Wealth: An Action Plan for Northwest Jacksonville - Rethink Homelessness, strategic creative grassroots initiative to help the community rethink who the homeless really are in Central Florida - Tampa Bay Homeless Resource Wiki
Sustainable transport activism
Wikipedia: Hiking trails in Florida (category)
News and comment
Miami's sharing potential, Apr 17 
The three-degree world: cities that will be drowned by global warming, Nov 3 
Orlando Becomes 40th (US) City to Commit to 100% Renewable Energy, Aug 9 
Historic Northwest Rising: A Lesson in Inclusive Community Activism, May 2 
Florida City Commits To 100 Percent Renewable Energy, Nov 23 
Nonprofit Org Creates Urban Oasis in Miami Where All Have Access to Locally Grown Food, Oct 31 
Sunday profile: Growing a sustainable society, Apr 24 
Don't Mourn Miami Just Yet, November 13 
October 24 - 30 Greater Sarasota's 4th Annual Eat Local Week
Citizens data initiative