The term ‘greenhouse gases’ (GHG) refers to a type of gas (and there are a few different gases that this can refer to) that is capable to hold or trap heat in the atmosphere. In other words, greenhouse gases are the type of gases that first absorbs infrared radiation and then actually emits thermal radiation back. This whole process is basically what causes the greenhouse effect. Without the greenhouse effect, this planet would have been much colder and difficult for the human race to survive. CLIMATE CHANGE IS A GLOBAL PROBLEM. THE PLANET IS WARMING BECAUSE OF THE GROWING LEVEL OF GREENHOUSE GAS EMISSIONS FROM HUMAN ACTIVITY. IF THIS TREND CONTINUES, TRULY CATASTROPHIC CONSEQUENCES ARE LIKELY TO ENSUE FROM RISING SEA LEVELS, TO REDUCED WATER AVAILABILITY, TO MORE HEAT WAVES AND FIRES. Sources: Ozone (O3) Methane (CH4) Water Vapor (H2O) Carbon dioxide (CO2) Nitrous Oxide (N2O) Although the Earth has natural cycles of extreme heat and extreme cold, we are causing an unnaturally quick global warming with our constant burning of fossil fuels. More and more of the thermal radiation that comes to us from the sun millions of miles aware is getting trapped on Earth because of the dense layer of many different greenhouse gases, which means that the average temperature of the Earth is on the rise and not set to stop any time soon. This means that many places are suffering from droughts more often throughout the year and some places are becoming completely inhospitable.