carbon pawprint noun [C]
UK /ˌkɑː.bᵊn ˈpɔː.prɪnt/ US /ˌkɑːr.bᵊn ˈpɑː.prɪnt/
a measurement of the amount of carbon dioxide in the atmosphere produced through activities relating to owning a pet

Our dogs’ carbon pawprints are largely related to their diets, with carbon-intensive ingredients such as meat being the main contributing factor … It has been estimated that the carbon pawprint associated with owning a medium sized dog is roughly twice that of running a typical SUV car, and the dogs in the USA are responsible for emissions equivalent to 13 million cars, or 64 million tonnes of CO₂ per year.
[vetchef.com, 9 March 2021]

planetarian noun [C]
UK /ˌplæn.əˈteə.ri.ən/ US /ˌplæn.əˈter.i.ən/
someone who buys, prepares and eats food in a way designed to have the smallest possible impact on the planet

Eating less meat and dairy is one of the ways we can have a positive impact on the future of the planet, as multiple studies on climate change have demonstrated … If you’ve ever tried Meatless Monday, vegan before 6, or any other not-vegan-all-the-time method in an effort to reduce your meat consumption, you’re probably on your way to becoming a planetarian.
[cnn.com, 6 December 2021]

pollution lockdown noun [C]
UK /pəˌluː.ʃᵊn ˈlɒk.daʊn/ US /pəˌluː.ʃᵊn ˈlɑːk.daʊn/
a period of time in which people are not allowed to leave their homes or travel freely, because of the high levels of pollution in the atmosphere

Delhi has been engulfed in a shroud of smog for the past few weeks. The air pollution has become so severe in India’s capital city that schools have been closed indefinitely, and work-from-home guidelines were implemented in the nation’s first pollution lockdown.
[newframe.com, 7 December 2021]

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