The average temperature of the Earth has been increasing continually since the late 19th century. The mean global temperature in the 1960s was 13.9 degree Celsius whereas in 2017 it was 14.9 degree Celsius. Thus, no one can deny the fact that the temperatures have been rising on our planet. Ice ages and warmer periods have occurred alternatively and naturally on Earth. Natural warming happens when Earth is closer to the Sun. But, it is the greenhouse gases that lead to a rapid temperature increase and disrupt the natural cycle of changes. The gases such as the oxides of carbon and sulfur are greenhouse gases. These gases, when present in the atmosphere, trap the incoming radiation and heat from the Sun. The phenomenon of atmospheric gases acting as a shield is known as the greenhouse effect. We humans have been primarily responsible for the release of these harmful gases. Our activities such as industrial production, petroleum extraction, transportation, burning fossil fuel, mining, cattle rearing, and deforestation are primarily responsible for global warming. The first impact of global warming is the melting of polar ice caps and glaciers. So, a loss of habitat for species in the frozen zone is likely. Losing tones of ice could result in the rising of sea levels, and inundation of coastal areas all over the world. Glaciers are the sources of our rivers. With no glaciers, many rivers could dry up, leading to severe water scarcity. As individuals, we too have the responsibility in making our planet a safe abode for our future generations. We should go for energy-efficient lights such as LED bulbs that don't generate much heat. We can drive less and use public transport instead. Recycling has to become a habit in our society as the production of new components takes lots of energy and leads to pollution too. Make judicious use of natural resources such as water. Plant trees as a single tree can absorb one ton of carbon dioxide over its lifetime. We should also use less electronic devices for recreational purposes. We live in a world where Alexa plays the music in the living room, and Siri sets the alarm on the phone. Not far is the day when most of us will have robots in our homes, loading the dishwasher and assembling our furniture. We already have drones, and experiments on driverless cars are going on. Computers are vital in the communication and transportation industries. They control our satellites and traffic signals. Through Big data and analytics, companies make business decisions. Technologies like Artificial Intelligence, Machine Learning, and IoT (Internet of Things) could bring a sea of changes in our daily lives. A range of industries right from agriculture, textiles to our defense field is highly dependent on computer technology. There does not exist a sector, which is untouched by the magic of computers. Computers, smart phones, and cheap internet data packs have revolutionized the field of education. A data-enabled mobile phone opens the door to vast resources. Online learning and distance education have changed the fortunes of many. The software programs are better than print media in presenting the subject to the students. In this way, they are more interested in learning and take initiatives to know further. It increases the quality of education that people receive. Moreover, computers have vast storage spaces, and the durability of the study material is also high. In specific fields like architecture and mechanical engineering, there is a paradigm shift in pedagogy. They learn and use software technologies like CAD and CAM. We know that the word 'computer' comes from compute and thus, they were mostly computing devices. The first computer was for the military, and the U.S. army used it for calculating artillery firing tables. Today, computers are used in tanks, planes, and ships to target enemy forces. They play a vital role in providing training and simulations to soldiers. They are essential to safeguard the confidential activities of the defense forces.