With the ever rising population of the world, the need to habitation has exponentially increased. The construction and real estate business is booming and various building materials are available in the market. As a result the natural resources are depleting and we are unintentionally killing our mother earth. Since ages, human race has been using concrete to build empires and forge civilizations. Concrete is the second most used material in the world, trailing only water. According to the U.S. Geological Survey, domestic production of Portland cement increased to more than 80 million tons in 2014 and 4.5 billion tons worldwide. Most of that production is in China, which consumed more cement in the last four years than the United States has in 100 years. The cement industry accounts for more than 5% of global carbon dioxide emissions. The majority of these emissions are due to the de-carbonation of limestone and the energy required to heat materials in a rotating kiln to temperatures exceeding 2,600 degrees Fahrenheit. According to the U.S. Department of Energy, domestic cement production accounts for 2.4% of energy consumption, which is lower than iron and steel mills at 11% and paper mills at 15%. The time is high that we start looking for environment friendly solutions to our building needs. Green cements can be a good replacement of the traditional cements. This study discusses some of the recent patent and technology trends in green cements.