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.

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

A coal fired power station in Queensland, Australia © WWF / James Morgan


Burning fossil fuels
The burning of fossil fuels like oil, gas and coal to generate electricity or power our cars, releases carbon dioxide (CO2) pollution into the atmosphere. The increase in CO2 and other greenhouse gases makes it difficult for the solar radiation that hits our Earth to escape. This means that heat is trapped in our atmosphere, raising the overall temperature of the planet.

Australians are big producers of CO2 pollution compared with the rest of the world. In fact, our level of CO2 pollution per person is almost double the average of other developed nations and more than four times the world average.

Plants and trees play an important role in regulating our planet's health and climate. They absorb and store carbon dioxide from the air and then release oxygen back into it, helping to clean the air and keep global warming to 1.5 degrees.

But humans clear vast areas of vegetation around the world for farming, urban and infrastructure development or to sell tree products such as timber and palm oil. Every year in Australia, we lose an estimated 500,000 football fields worth of forests and woodlands due to excessive tree-clearing.

When vegetation and trees are removed or burnt, the carbon that they store is released back into the atmosphere as CO2, which further contributes to global warming. Up to one-fifth of global greenhouse gas pollution comes from deforestation and forest degradation.

Agricultural Production
Ruminant animals, livestock like sheep and cattle, produce methane, a greenhouse gas. When livestock graze at a large scale, as they do in Australia, the amount of methane produced is a big contributor to the warming of the planet.

Impacts of a warming climate

Drought impact a dried up farmer\ 


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 by 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 the Antarctic.

This would mean severe suffering for humans and other life on the planet.

  • Wildlife: Our Earth’s unique wildlife depend on intricate and complex ecosystems to survive. That’s why even a small change to the planet’s climate can disturb nature’s balance and threaten their existence.

  • People: Humans rely heavily on the natural environment. It provides us life - from the food we harvest and eat, the air we breathe, the water we drink and the everyday products that we consume. Sadly, climate change will impact the poorest and most vulnerable people that contribute the least to global warming.

  • Ecosystems: Even the smallest change to temperature and rainfall can be damaging to our delicate ecosystems. It can impact the pollination of flowers, change the hibernation and migration patterns of animals and disrupt entire food chains.

  • Food and Farming: Increasing droughts, longer and more frequent heatwaves, flooding and extreme weather events due to climate change will make it more difficult for farmers to grow crops and graze livestock. This means that the supply of produce will become limited, and prices will rise at supermarkets.

  • Water: With severe droughts and reduced rainfall, we may see shortages in freshwater supplies.

  • Coastal Erosion: As the Earth continues to warm, ice sheets will melt, causing sea levels to rise dramatically. This will affect coastlines across the globe, causing erosion and residential damage.

  • Health: The severity of heatwaves may lead to illness and death, especially among the elderly and vulnerable communities. It can also lead to more mosquito-borne diseases due to higher temperatures and increased humidity.

  • Coral bleaching: Higher ocean temperatures will impact coral reefs and can cause major coral bleaching events like the ones in 2016 and 2017 that destroyed more than one-third of the Great Barrier Reef.

Working for change

Wind farm, Albany, Western Australia © Lawrence Murray / WWF-Aus 


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



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This Earth Hour, we're calling on all Australians to sign up to switch off and join a worldwide community of millions taking #TimeOutForNature.