Addressing climate change

According to the United Nations, climate change is a defining issue of our time. As the planet's population, economies and standards of living grow, so does the cumulative level of greenhouse gas (GHGs) emissions. The most abundant greenhouse gas is carbon dioxide (CO2). The concentration of the GHGs in the earth's atmosphere is directly linked to the average global temperature on Earth. Because CO2 lingers in the atmosphere for centuries or even longer, the sooner we curb emissions, the better our chances of limiting the temperature rise.