The climate of a region is its average or typical weather over a period of time. While we may get a cool day in summer, or a warm day in winter, the climate is the long-term picture of conditions.
Earth’s climate has changed throughout the planet’s 4.5-billion-year history. During this time, conditions have become warmer or cooler at various periods, one of the most notable being the Ice Age, which is often considered as one of the causes for wiping out the dinosaurs.
Scientific observations show that Earth’s climate has rapidly changed in the last 100 years. The average Australian temperature has climbed to around 1 °C higher. While it might not seem like much, even a slight change can have major impacts on Earth’s delicate balance of ecosystems. With such a rapid change, it doesn’t leave enough time for plants, animals and humans to adapt.
Major causes of climate change
Human activities, like burning fossil fuels, deforestation and agricultural production are the major cause of climate change. The burning of fossil fuels like oil, gas and coal release carbon dioxide (CO2) which accumulates in the Earth’s atmosphere. Deforestation also releases CO2 as well as reduces the number of trees that are able to absorb excess CO2.
The increase in CO2 and other gases make it more difficult for the solar radiation that hits Earth to escape, trapping the heat and raising the overall temperature of the planet’s surface. While the greenhouse effect at natural levels keeps Earth warm and habitable, too much of the greenhouse effect, intensified by human activity, causes the Earth to overheat. This is known as the enhanced greenhouse effect.
Impacts of a warming climate
The planet’s various regions are not all experiencing the same effects of Earth’s temperature rise at the same time. Many regions are experiencing extreme and unpredictable weather, with some becoming hotter and others becoming colder, wetter or drier.
Scientists have projected that our climate could heat up to as much as 6 °C by the end of the century if carbon emissions aren’t cut back. This increase can break down fragile ecosystems and crucial food chains, and result in widespread rainforest destruction, dramatic sea level rises and greatly increased melting of ice sheets in Greenland and Antarctica. This would mean severe suffering for humans and other life on the planet.
Working for change
WWF understands that climate change poses a fundamental threat to species and people’s livelihoods. We advocate solutions to reduce our carbon emissions and slow down climate change – like switching to renewable energy including solar and wind.
WWF-Australia is committed to:
Limiting global warming to 1.5 °C above pre-industrial levels by the end of the century
Achieving a net-zero carbon economy in Australia before 2050
Achieving 100% renewable energy in Australia before 2050, including 100% renewable electricity before 2035.