AI Server Farms Pose Hidden Heat Pollution Risks Amid Israel's Expansion Plans
The rapid growth of artificial intelligence and its applications has driven a global surge in server farm construction, raising concerns beyond just electricity and water consumption. Server farms require massive energy inputs, often generated from fossil fuels, contributing significantly to greenhouse gas emissions and climate change. In Israel, while the government recently approved measures to accelerate server farm development, the Electricity Authority has temporarily halted new connection approvals due to worries about grid stability, supply reliability, and rising costs.
Beyond national and global environmental impacts, server farms emit substantial heat into their local surroundings, a form of thermal pollution that is often overlooked. Recent research highlights that large data centers create new local climate zones known as heat islands, which can raise ground temperatures by 2 degrees Celsius or more and affect air temperatures several kilometers away. This phenomenon negatively impacts natural ecosystems, nearby communities, public health, urban infrastructure, and increases electricity demand for cooling, thereby exacerbating urban heat island effects.
Planning and operating server farms must therefore consider their thermal footprint alongside their carbon footprint. This includes evaluating site location and size relative to local wind patterns, establishing appropriate buffer zones from residential areas, and implementing advanced cooling technologies such as underground placement, liquid cooling, and evaporative systems. Additionally, waste heat should be recycled for nearby heating needs in buildings and industrial facilities.
Thermal pollution from human activities is a recognized but underappreciated environmental issue, affecting ecosystems and human well-being. For instance, power plants and industrial processes that discharge heated water alter aquatic habitats, while urban heat islands caused by traffic and air conditioning increase local temperatures and health risks. Server farms contribute similarly to these effects.
In Israel, connection requests for server farms have reached about 27,000 megawatts, equivalent to releasing 27,000 megawatts of heat. A 100-megawatt server farm emits as much heat as 67,000 two-horsepower air conditioners running continuously or 3,000 gasoline cars operating nonstop. Heat emissions are especially impactful at night when other heat sources diminish, slowing environmental cooling.
Currently, Israel is debating the necessity and policy framework for expanding server farms, alongside preparing the electricity sector for future demands. It is crucial to incorporate thermal pollution considerations and urban heat island mitigation strategies into environmental impact assessments and planning processes. Professor Adi Wolfson, head of the Green Engineering master's program at Sami Shamoon College of Engineering and author on environmental topics, emphasizes integrating advanced solutions to reduce heat pollution from server farms at the source.
