Today I'm going to tell you a story on carbon dioxide. It's about how can we think about 10 carbon dioxide into liquid fuel using sunlight. In the past many decades we are mainly using fossil fuel as our main energy source and as a result our planet Earth is facing many challenges and problems. For example the CO2 concentration using the atomosphere is already passing 400 ppm. We have issue about global warming, we have the pollution issue and the sea level is rising. So in order to mitigate these problems we need to introduce more and more renewable energy technology into our overall energy portfolio. And one of such technologies is this technology called artificial photo synthesis and this technology is a process that can convert solar energy and restore it into chemical bond. So every day when we are driving our car we are basically burning the gasoline and using its energy and releasing the CO2 and water back into the environment. And this artificial photo synthesis technology can turn the CO2 and water back into chemical fuels using sunlight. So if we can come up with artificial photo synthetic system that can do this job with good efficiency and low cost then essentially we are offering a carbon neutral solution to our energy and the environmental problem. Now the question is how can we do this? So in this regard we can certainly learn from nature and if we look around nature is doing this photo synthesis every day where look at the green leaf, the green leaf basically presents CO2 absorber the sunlight and it turns that into carbon hydrates and the release oxygen back into the environment. So nature is telling us this is durable as a scientist what we need to do is follow the chemistry and the physics over there and trying to design artificial photo synthetic system. Moving back more than 10 years ago when we launched this helios program at the Lawrence Burke National Lab where put this design, particular artificial photos in synthetic design on paper, in order to make this design work we need to discover new class of semi-conductive materials that capture sunlight. We need to discover new class of catalyst to promote these chemical reactions we want to carry out. And over the past 10 years we finally figure out ways to link a collection of biological and synthetic catalysts to the semi-conductive nanostructures and indeed we can do the chemistry as we planned. So now we have this handlehold device. If you bubble in CO2 shining with sunlight we can basically produce chemicals, fuels, polymers or even in some cases pharmaceutical intermediates to make drugs. And even better our artificial photos in synthetic system intensively solar to chemical energy combustion efficiency is already better than nature. So with this artificial photos in synthetic technology in hand I think in the near future our gas station would maybe what looks like this. So we will have this solar fuel generator installed on the rooftop of our gas station so that we can produce the gasoline on site. And not only that the same technology can be used in deep space and mass missions. And we can think about producing the chemical fuels in the deep space that satisfies the energy need in these deep space missions. Maintime actually provide oxygen to the crew members. More importantly the same concept can be applied to do the nitrogen fixation to make fertilizers in the deep space again. So I'm sure a Matt Damon would love this idea because he can use the fertilizer to grow his potatoes on the mouse. Thank you very much.