Earlier this month, the UN released a sobering report on global warming, warning that carbon dioxide emissions would peak sooner than previously thought. Environmentalists are calling for a radical path forward. "It's clear that we're at the edge of disaster and we have to really move fast now," warned Lewis Fulton, Co-Director of the STEPS Program within the Institute of Transportation Studies at the University of California, Davis. Fulton, one of two guests on this weekend's In Depth, has worked internationally in the field of transport, energy, environment analysis and policy development for more than 2 decades. How--or, can--we transition to a more environmentally sustainable way of life? "The solutions are many and the challenge is complex," explained UC Davis Assistant Professor Rebecca Hernandez. "And I think a lot of the listeners who may be tuning in right now can feel a little bit overwhelmed and maybe that the decisions that they're making may not have an impact on what's really happening. And I can empathize with that as a scientist." Hernandez, who joined Fulton with guest host Jeffrey Schaub on In Depth focuses her research efforts on aridland ecology and sustainability. "Cost is a huge barrier to renewable energy penetration," she said. "There are several policy based tools that we can use. But ... what I'd like the listeners to know is that every decision that they make to make their house more green or to reduce their intake of meat or to ride their bike, all of that really adds up at the global scale. What you're doing right now is really making a difference and when we're looking for climate change heroes in every community across diverse groups. We need climate change heroes in our government, in our churches, in our firms and businesses and in the communities that we exist in."