Earth Hour is all about images. It is about one finger on a light switch, which has an impact visible from space. It is a global movement that is pitting positive energy against the seemingly relentless bad news of global climate disruption and disaster.Climate disruption has given us some very stark images last year the huge satellite picture of Hurricane Sandy over the eastern United States, cars bobbing up from underground carparks in New York, teenagers clinging to trees, and houses looking like islands surrounded by lapping water in the southern US. Floods in Brazil, deadly cold snaps in Europe and fires and floods in Australia. Sometimes is seems as though there is nothing we can do and there is no will for change.Earth Hour is a powerful referendum on climate change. It is is a signal that despite the climate deniers, despite the other issues that we all have to deal with, despite the gloom and pessimism, globally people care and want to see action on climate change. Earth Hour is a global movement sponsored by the WWF, which has been adopted by thousands of towns and cities in 152 countries in all seven continents.This year over a billion people will be involved. Concerned citizens are asked to turn out their lights for a single hour: 8:30 pm to 9:30 pm on March 23. A wave of darkened towns and cities will sweep around the globe, starting in Australia and New Zealand as each country reaches 8:30 pm to visibly demonstrate that there is a will for change.So what can be done? Halting the seemingly relentless climb of CO2 in the atmosphere will require large-scale solutions, but will also require each of us to reduce our own electricity use. In Bermuda we burn fossil fuel for electricity so it converts directly into carbon dioxide emissions, but also into dollars flying out of our pockets. Basic energy saving ideas can save you at least 10 percent of your power bill.Here are some tips:Plug hot water heaters and heated towel rails into timers, turn off lights, turn off air-conditioning when you are not at home, set the thermostat up a couple of degrees on your cooling and unplug chargers. When you walk into a dark room at night, it isn’t really dark frequently there are numerous small red or green lights shining back at you each of those is burning electricity and many of them can be turned off. Not all climate feedback loops are vicious: Australia recently discovered that its demand for power is going down several years earlier than predicted. This is because of social, technological and economic amplifiers. For example, if someone puts a solar hot water system on their roof then they often spread the word among their friends.Increased demand results in lower prices, and their awareness is boosted so they are more careful about power use in other areas. Reduced demand on the grid means reduced power losses in lines and switches. This is a virtuous cycle and one we can easily establish here.As the Earth Hour organisation puts it: “There is no doubt about it: the world is facing some of the most critical environmental challenges in its history. That may make the journey to a sustainable future seem difficult to imagine, but it is far from impossible. Change this big needs you. It needs every one of us. Together our individual actions add up to make a difference collectively. In fact, change is already underway.”So come and be counted: Greenrock and the Earth Hour Council: BELCO, City Hall and the Bermuda Government Departments of Sustainability and Energy, are throwing a party, in fact this is our fourth year running: we are having great entertainment, the famous BELCO bikes, free movies, a glow in the dark fun-run. Come and join us on March 23 from 5-10pm: let’s take a stand and take it visibly together. Go online to www.earthhour.org to get inspired, and go to www.greenrock.org/earthday to see how you can join in here. Let’s use Earth Hour, March 23, as a global symbol that we do care. (Oh and when you come to the party don’t forget to turn out your lights at home!)