Science as a practice is not particularly green. Despite producing the research that drives climate policy and environmental protection, the day-to-day operations of scientific research consume enormous amounts of energy, generate significant plastic and chemical waste, and carry a surprisingly large carbon footprint. The gap between what science studies and how science operates is one of the more striking ironies in the sustainability conversation.
Why Labs Use So Much Energy
U.S. laboratories use far more energy and water per square foot than standard office buildings, according to the Department of Energy. The gap is significant: stringent health and safety requirements mean that ventilation systems constantly push and pull air through lab spaces, fume hoods run around the clock, and specialized equipment draws power nonstop.
One of the biggest energy hogs is cold storage. A single ultra-low temperature freezer, the kind used to preserve biological samples at minus 80 degrees Celsius, consumes roughly 20 kilowatt-hours of energy per day. That’s about as much electricity as an entire average U.S. household uses in a day. A large research university might operate hundreds of these freezers simultaneously. Add in centrifuges, autoclaves, incubators, and climate-controlled clean rooms, and a single research building can dwarf the energy draw of a comparably sized office tower.
The Carbon Cost of Computing
Modern science increasingly runs on computing power, and that computing has its own environmental price. The information and communications technology sector was responsible for between 1.8% and 2.8% of global greenhouse gas emissions in 2020, which is actually higher than the aviation industry. High-performance computing systems used for genomics, climate modeling, physics simulations, and materials science make a substantial contribution to that total.
Artificial intelligence has amplified this trend. Training large language models and running complex machine learning analyses requires enormous energy. The main source of emissions in computational science is straightforward: the power draw of computers during intensive analyses. For research groups that rely heavily on supercomputing clusters, the electricity bill (and the carbon attached to it) can rival or exceed the emissions from running physical lab equipment.
Conference Travel Adds Up Fast
Flying to conferences is one of the largest and least-discussed contributors to a researcher’s personal carbon footprint. A study of magnetic resonance conferences found that attending a single five-day conference produces between 1 and 3 tons of CO2 per person, with the variation depending mostly on how far attendees fly. To put that in perspective, attending one overseas conference can generate more carbon than running specialized lab equipment for an entire year in a country with clean electricity, like France.
When researchers added up all the carbon sources for a typical scientist in their field, including building energy, equipment manufacturing, computing, sample preparation, and lab operations, the total came to roughly 2.5 to 7 tons of CO2 per researcher per year. Conference travel sits on top of that as a major additional expense. The transportation to get to a conference typically produces more than 1 ton of CO2 per person, while the conference itself (venue, food, materials) adds only several tens of kilograms.
Chemical and Plastic Waste
Laboratories generate a steady stream of hazardous chemical waste: solvents, reagents, acids, heavy metals, and biological materials that require careful handling and disposal. California regulations, which reflect broader national standards, limit labs to accumulating no more than 55 gallons of non-acute hazardous waste or one quart of acutely hazardous waste before it must be treated or removed. Treatment must happen within 10 calendar days of the waste being generated. Incompatible chemicals must be kept separated, and each batch can only contain waste from a single procedure.
These protocols exist because the volume and toxicity of lab waste genuinely warrant them. Academic chemistry departments, biomedical research centers, and pharmaceutical labs cycle through enormous quantities of organic solvents, staining agents, and reactive compounds that would be damaging if released into water systems or landfills. The disposal process itself requires energy, specialized transport, and in many cases high-temperature incineration.
Plastic waste is another persistent issue. Life science labs in particular burn through single-use pipette tips, culture plates, gloves, tubes, and packaging at a rate that dwarfs typical office waste. Much of this plastic is contaminated with biological or chemical material, which means it cannot enter standard recycling streams and instead goes to specialized waste treatment.
Green Chemistry Is Making Progress
The field of green chemistry has been working to reduce the toxicity of lab processes by redesigning reactions from the ground up. Some tangible examples have emerged. The conventional synthesis of metronidazole, a common antiparasitic drug, traditionally required highly toxic methylating agents like dimethyl sulfate. A greener route now achieves the same result using methanol as the methylating reagent, which is far less hazardous. Researchers have also developed methods for synthesizing the antimalarial drug pyronaridine using water as the reaction medium instead of toxic organic solvents. Other protocols now use recyclable ionic liquids in place of volatile, poisonous solvents.
These are real improvements, but they represent individual wins in a vast landscape of chemical protocols. The 12 principles of green chemistry, which call for things like using renewable feedstocks, designing for energy efficiency, and minimizing waste, provide a framework. Adoption, however, remains uneven across disciplines and institutions.
Certification and Institutional Change
A growing number of labs are pursuing formal sustainability certification. My Green Lab, the most widely recognized program, evaluates labs across 14 core categories spanning energy use, waste reduction, water consumption, and day-to-day engagement with sustainable practices. Labs receive one of five certification levels: Bronze, Silver, Gold, Platinum, or Green, based on how deeply they’ve adopted changes. The program provides a structured assessment tool that guides labs through incremental improvements rather than demanding wholesale transformation overnight.
At the funding level, the European Union’s Horizon Europe program, with a budget of €95.5 billion for 2021 through 2027, explicitly ties research and innovation funding to climate goals and the UN’s Sustainable Development Goals. The EU’s LIFE programme supports projects in climate change mitigation, circular economy, and clean energy transition. These funding structures create financial incentives for research institutions to take sustainability seriously, though the requirements focus more on what research addresses than on how sustainably it’s conducted.
The Core Tension
Science occupies an unusual position in the sustainability conversation. It provides the evidence base for understanding climate change, biodiversity loss, and pollution. It develops the renewable energy technologies, carbon capture methods, and sustainable materials that societies need. But the process of doing science, running energy-intensive labs, flying to conferences, generating chemical and plastic waste, and powering massive computing systems, carries a real environmental cost.
The honest answer to whether science is green is: not yet, but it’s becoming more self-aware about the problem. Freezer challenges that encourage labs to defrost and consolidate samples, virtual conference options that emerged during the pandemic, green chemistry alternatives, and certification programs are all signs of a shift. Whether that shift happens fast enough to match the urgency of the environmental problems science itself has documented is a different question entirely.