Globally we are responsible for ~60 billion tons of greenhouse gases entering our atmosphere and oceans each year, and since the late 19th century we have raised the CO2 concentration of our atmosphere from ~280ppm to ~418ppm, and the average global temperature by ~1.3 °C,
Meat consumption results in the annual culling of ~70 billion land animals. We use ~12x as much land to produce meat, dairy and feedstock than we would otherwise use to feed one person on a plant-based diet and it takes ~1,500 gallons of water to produce one pound of beef.
The human immune system is compromised by the excessive consumption of meat, dairy and refined carbohydrates, leading to health outcomes that are degraded compared to people living in the Blue Zones, where healthspan almost equals lifespan, and life expectency is ~10 years longer than the general population.
Agricultural monoculture progressively degrades the health of our topsoil, increasing water consumption and pollution via run-off, and is liable to crop failure simply due to lack of diversity of genetic material. Many food additives and pollutants cause inflammation, disrupting the immune and endocrine systems; an immune system that would otherwise eliminate ~10K cancer cells per day.
Emissions in electricity and heat generation, are generally made by machines that use fossil fuels as the energy source. Power plants cannot simply be turned off and on again; there are costs to overproducing to meet peak demand. There is no widespread adoption of carbon-capture technologies. Power plant operating efficiency is ~33%, much less if you account for all the losses; ~2% for a light bulb. Transportation does a little better, the overall automobile efficiency from crude oil to transmission, is ~10%.
We are over-fishing the oceans and eliminating bycatch in such quantity that the global fishing industry is expected to collapse by ~2050. Algae and phytoplankton produce ~50% of the atmospheric oxygen; without fishstock to provide important nutrients, this ability may too be compromised.
We were believed to be in the interglacial Holocene Era, heading for a new ice age. Now, in the Athropocene Era, we are responsible for the melting of all land ice, thought to be inevitable, and expected to increase sea-level by ~200ft; conservatively ~6ft by the end of the century. This is significant because many of our population centers are located on river estuaries, with ~10ft elevation.
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