"I think that the green cause is different in that it is beginning to be expressed in legislation," he said.
David Willett, a spokesman for the Sierra Club, agrees.
"In terms of big issues, nothing's bigger than global warming," Willett said. "There are a lot more cities and county governments and states that are taking action."
Both New Jersey and Hawaii have set mandatory greenhouse gas reductions, while mayors around the country are signing on to a climate change agreement.
Willett believes that economic issues will sustain consumers interest in the green movement.
"[Green] technologies are just going to stay with us forever and get better," he said. "Once you switch to those products and are saving money, there's less incentive to go back to a less efficient, more expensive product."
But will businesses keep making these products?
"There have been people who have wanted to lead a greener lifestyle for a long time. More and more businesses are realizing that it's a profitable business model," Willet said. "What time will tell is whether businesses will be able to make money in the long term on it…Green lifestyle as purely marketing -- those [companies] may not be around as long."
Eric Horng contributed to this report.