Refineries produce a lot of CO2. Of course, they prefer to produce transportation fuels. Chemistry, and in particular catalysis, can be used to make this process more efficient. We have found a way by using nanotechnology to increase the porosity of the zeolites, which are the catalysts that are currently used to produce transportation fuels. By doing that, we allow the bulky hydrocarbon, which are found in the crude oil, to find an active site to be transformed into gasoline and diesel more efficiently. So more of the crude oil that is in the barrel goes on to produce gasoline and diesel, and less CO2 is produced. This is a very nice example of how chemistry can be used to provide not only benefits to the industry, but also to reduce our impact on the environment.