1st post

While food systems are complicated, and research is still evolving on what the most environmentally friendly diet is, experts mostly agree that cutting down on meat, and red meat in particular, is a better choice for the environment. This is because the production of red meat uses a lot of feed, water and land. Cows themselves also give off methane emissions, which is a harmful greenhouse gas.  (from:https://www.nationalgeographic.com/environment/2019/01/commission-report-great-food-transformation-plant-diet-climate-change/  For that reason, eating a vegan diet is likely to be best for the environment, say experts. According to a study published in 2017 in the journal Environmental Research Letters, red meat can have up to 100 times the environmental impact of plant based food. According to some estimates, beef gives off more than six pounds of carbon dioxide per serving; the amount created per serving by rice, legumes carrots, apples or potatoes is less than half a pound.

2nd post
Scientists attribute the global warming trend observed since the mid-20th century to the human expansion of the "greenhouse effect"1 — warming that results when the atmosphere traps heat radiating from Earth toward space. Certain gases in the atmosphere block heat from escaping. Long-lived gases that remain semi-permanently in the atmosphere and do not respond physically or chemically to changes in temperature are described as "forcing" climate change. Gases, such as water vapor, which respond physically or chemically to changes in temperature are seen as "feedbacks." https://climate.nasa.gov/causes/