Astronomical research infrastructures, like space telescopes and observatories, have a significant carbon footprint. A recent study estimated that these facilities contribute around 20.3 million tons of carbon dioxide equivalent globally, with each astronomer responsible for about 36.6 tons per year. This makes research infrastructures the biggest source of greenhouse gas emissions in an astronomer's work, more than traveling or computer use. The study used factors linking cost and payload mass to carbon footprint to calculate these values. The researchers suggest exploring ways to make astronomical research facilities more environmentally sustainable to reduce their impact on climate change.