A passionate environmentalist, Loren started her campaign for environmental protection and preservation in the 1980s when she became broadcast journalist.
During her incumbency as Senator, she actively espoused for the passage of important environmental measures such as the Philippine Clean Air Act (RA 8749) and the Ecological Solid Waste Management Act (RA 9003).
Apart from this, she also espoused the clean up of toxic wastes left behind by former United States military bases in Subic and Clark, and has helped provide medical assistance to children who were victims of toxic waste contamination.
Among her co-authored laws on environmental protection are: Mt. Kitanglad Range Protected Area (RA 8978), Batanes Group of Islands Protected Area (Ra 8991), and the Conservation and Protection of Wildlife Resources Act (RA 9147).
In 2009, she espoused for the passage of the Climate Change Law, a landmark legislation that is considered as a model for other nations.
As current Chairwoman of the Climate Change Oversight Committee of the Senate, Loren ensures that climate change, including adaptation and disaster risk reduction, is addressed as a national priority and considered in policy making and development planning.