Terra Environment Dictionary — M

Terra Environment Dictionary is a resource of words, terms and phrases related to environmentalism, as defined by society.

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The planet that is most similar to Earth in the Solar System, in terms of environmental and geophysical conditions. Because of this, it is believed that Mars may be able to support life (after terraforming), leading to great interest in studying the possibility of colonising Mars as a second home for humans, as Earth becomes increasingly more uninhabitable thanks to, well, humans. That is ludicrous, however, as if we had the knowledge and technology to control the climate of Mars, we could control the climate of Earth to bring it back to a healthier state—way more easily.


A chemical compound with the chemical formula CH4.
2. a greenhouse gas that traps 34 times more heat than carbon dioxide.
60 percent of atmospheric methane comes from human-induced sources, such as agriculture (cattle and rice paddies), waste dumps and coal mine leaks. Natural sources include wetlands, termites and wildfires. There are also significant amounts of the gas held in frozen ground in the arctic regions, which are released into the atmosphere as the permafrost thaws.


The flesh of animals, consumed as food. Contrary to popular opinion, human beings do not have to consume meat. Each time you eat meat, you are inflicting damage on:

  1. the environment: carbon emissions, deforestation, and excessive land and water use and pollution;
  2. animal welfare and rights: injuries, disease, mutilation, unnatural growth and reproduction acceleration, systemic abuse by workers, extreme confinement and lack of freedom, and slaughter that is often not quick nor painless—after a life of misery from birth to being deemed “cost-inefficient”; and
  3. your health: in spite of the heavily-disputed meta-analysis published in October 2019—which, in summation, made just a “weak” recommendation based on “low-quality evidence” that you don’t need to reduce your red and processed meat intake for personal health—the consumption of meat still stands to have significant impact on public health, i.e. increased risks of cardiovascular diseases and cancer on a population level vs. a personal level.

… all for the sake of taste.

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