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With the average global temperature rising every year, the frequencies of turning on the air conditioner have been intensifying in recent years.  In 2019, Hong Kong consumed 4.57 billion kWh of electricity[1], of which air conditioning made up around 28% (1.24 billion kWh of electricity) of the total [2], which equates to releasing  7.36 million tonnes of carbon emission to the planet. Once the carbon dioxide (CO2) concentration increases in the atmosphere, it acts like a thicker glass roof of a greenhouse trapping the heat in the atmosphere, which accumulates the temperature of the Earth. If we are more relying on air conditioning when the weather gets hotter, forming a vicious positive feedback in heating up the planet. Therefore, reducing the usage of air conditioner as well as diminishing carbon emission would be a better way to cool down the temperature!

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Under the pandemic condition, people spend more time at home, and may increase the usage of air conditioning at home. When the climate change is increasingly severe, we should live a greener way by reducing carbon emission. We could start by using less air conditioning.​​​​​​​​​​​​​​​​