Is global warming caused by human activities? Although the Earth has supported humans and life for a long time, it faces many problems. One of the problems is that the Earth is warming. It leads to the melting of glaciers and disasters such as tsunamis. According to the Union of Concerned Scientists, extreme weather events such as rising sea levels, more frequent heat waves and the increasing risk of wildfires are the result of global warming. It is true that drought periods are becoming longer and fires are on the increase. I believe human activities are warming our Earth and leading to an increase in weather events. I think one reason for this problem is the gas emitted from burning fossil fuels to produce electricity and drive cars. These gases are called greenhouse gases which include carbon dioxide (CO2), methane (CH4) etc. (United States Environmental Protection Agency). CO2 is the main greenhouse gas and enters the atmosphere through the burning of coal and oil. Spotts (2013) states that more than half of global warming is due to greenhouse gases produced by human activities. Deforestation is also another reason for global warming due to human activities. We use a lot of trees and other natural resources. Trees are cut down or burned for livestock, raw material plantations. According to Salleh (2014), livestock are responsible for 12% of greenhouse gases because forests are cut down to make way for pastures. Clearing forests causes global warming because trees absorb carbon and other air pollutants. If forests disappeared, they would no longer be available to absorb CO2. As a result, a lot of CO2 will be released into the atmosphere and lead to global warming. Can we reduce global warming? I believe we can reduce global warming. CO2 emissions could be reduced if fossil fuels were replaced with new energy resources. Wind and hydropower are replacing fossil fuels. Unlike oil and gas, wind energy and water have no limitations and do not produce greenhouse gases. It can help reduce pollution and prevent temperature rise. We can reduce our consumption of fossil fuels. For example, by using an electric car or a hybrid car, reducing the number of miles we drive is one way to reduce fuel consumption. Recycling is another solution to this problem because the forest is preserved. We have limited natural resources and they are running out. Recycled paper can save many trees and these can help prevent global warming. For example, according to the Global Alliance for Incinerator Alternatives, recycling saves 3 to 5 times the energy generated by waste-to-energy plants.