Since 2007, this home-grown event has spread to much of our planet, involving millions of people who are concerned about the impact of climate change.

This year's theme is “Switch off for the Future,” acknowledging that our actions on climate change will shape the future for our children and grandchildren.

Since 2007 there have been positive steps made to deal with climate change. As we know, countries came together in Paris last year to form a historic global agreement, the aim of which is to limit emissions to prevent warming of above two degrees.

Many countries are moving towards renewable energy sources and away from fossil fuels to reduce their carbon emissions. This is a good start, but government action does not in many cases reflect the urgency of the situation. Political will is frequently lacking.

Our hour without lights is a good time to reflect on what we as individuals can do to fight climate change, and assist those in power to carry out agreements made in Paris. Here are some suggestions for discussion during Earth Hour.

We can think about what we know about global warming and the effects of climate change. It may be necessary to do some research when the lights go on. There is ample information online from reputable sources about the physics of global warming and how it affects our weather and climate.

Politicians are more likely to take action on issues if they are encouraged to do so by those who put them in power. Earth Hour is an opportunity for us to think about writing to our politicians to express our concerns about climate change, and to urge them to urgently support legislation and action that will reduce our emissions.

Earth Hour is also a good time to examine our lifestyles and consider what we can do to reduce our carbon footprint. There are changes most of us can make in our consumption and use of resources. Again, when we switch back on, there is plenty of online information about how we can do this.

 Another action we can take to observe Earth Hour is to join with Environmentally Concerned Citizens of Orange and Orange Dirt Music at the Environmental Learning Facility, Orange Showground at 7pm.

Bring along a picnic and listen to Dr Andrew Rawson, Adjunct Associate Professor from CSU speak on current aspects of climate change.

After Andrew's talk you are invited to join with Orange Dirt Music in an evening of entertainment of music, song and laughter.