For a small country with a little population, we have some big ideas on how to keep NZ clean and green. For example, deciding to drive more electric vehicles, because they can be fuelled by electricity that our country generates from renewable sources every day. The benefit to us now and to future generations could be enormous. And with hardly any carbon emissions, the impact these electric cars have on the environment, you could say, is tiny. LOUD RUMBLING INDICATOR CLICKS RHYTHMICALLY (GASPS) SILENCE (EXHALES SLOWLY) Mate, I'm so sorry. I thought there was time. You just pulled out. I don't have time to stop. It was a simple mistake. LOUD RUMBLING Please. (VOICE TREMBLES) I've got my boy in the back. I'm going too fast. I'm sorry. (SOBS) SEAT BELT CLICKS EERIE CREAKING HARSH WHOOSHING The calculator crunches the numbers for you. Installing a solar-energy system can cost many thousands of dollars, so will the numbers stack up for you? This is Dr Alan Wood from the University of Canterbury. His team has developed a calculator that will help you decide. Alan? The calculator crunches the numbers for you. It takes into account things like whether you're at home during the day and using power, as that can make quite a difference. So it's easy to use? Absolutely. For more information, visit energywise.govt.nz