But he is hard at work. He and his team currently are trying to make algae that can change carbon dioxide back into fossil fuel.

VOA: special.2010.07.20

And that if we want a positive earth for future generations, we all need to make commitments to be change agents so that we don't destruct our natural resources."

VOA: special.2010.01.21

"We have to start doing things that are going to make a difference to change this behavior, because I really don't want to hear about four thousand more kids dying next year."

VOA: special.2010.07.01

"That means protecting the rights of Egypt's citizens, lifting the emergency law, revising the constitution and other laws to make this change irreversible and laying out a clear path to elections that are fair and free.

VOA: special.2011.02.12

"And I said to him that those were two easy promises to make because those two things I could not change."

VOA: standard.2009.10.01

Kevin Volpp,director of the University of Pennsylvania's Center for Health Incentives, says these programs make it easier to take that first step to change.

VOA: standard.2010.07.16

She also said the U.S.aid community must have the courage to rethink its strategies to make sure that the programs achieve lasting change in recipient nations.

VOA: standard.2010.01.06

I completely failed to understand the depth of the kind of cultural transformation that we were going to have to make it we were ever going to deal with climate change."

VOA: standard.2010.04.21