Isn't it very hot today? Remember those days when the weather wasn't extremely hot or cold? The reason I ask you all this is to address the issue of climate change. For years past, climate has been a crucial topic affecting each of us and our planet Earth. Climate change is a fact. We must act urgently if we are to avoid an irreversible build-up of greenhouse gases and global warming with a potentially enormous cost to the economy and society around the world. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original Essay My thesis is that climate change has already had enormous effects on the environment and our daily lives, and we must do our best to reduce greenhouse gas emissions to offset rising global temperatures. According to the official website of the Australian Government Bureau of Meteorology, as of the end of 2017, the Earth had warmed by approximately more than 1 degree Celsius since 1910, when records began on a global scale. That figure includes the ocean surface. Warming is greatest over land, and even greater in the Arctic and parts of Antarctica. That number may seem low. In our daily lives we experience much larger temperature swings due to weather systems and the changing seasons. But when averaged across the entire planet and over the course of months or years, the temperature differences become much smaller. So an increase of 2 degrees Celsius since the 19th century is actually very large. The substantial warming that has already occurred explains why much of the world's land ice is starting to melt and oceans are rising at an accelerating rate. The heat that accumulates on Earth due to human emissions is roughly equal to the heat that would be released by 400,000 Hiroshima atomic bombs exploding on the planet every day. Scientists believe that most, and probably all, of the warming since 1950 has been caused by human releases of greenhouse gases. If emissions continue to be ignored, they say global warming could eventually exceed 8 degrees Celsius, which would turn the planet into a hellish world and thus undermine its ability to support a large human population. Please note: this is just an example. Get a custom paper from our expert writers now. Get a Custom Essay The threat of climate change must be taken very seriously. Climate change and its impact on our environment, our economies and our security are the defining issue of our era. But every day of inaction makes its consequences increasingly irreversible, so we must act now.