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117.7 tonnes of Co2e per kid per parent per year in the USA (58.6 tonnes average when including all the poorer countries).Wynes et al. 2017
A conservative estimate is that we need to emit less than 2.1 tonnes in total per person per year to try to prevent catastrophic Anthropogenic climate change. Girod et al. 2013 (life expectancy/2050).
117.7 > 2.1
We need a fertility rate of about 0.01 for several decades.
Human overpopulation is not only the biggest contributor to push us into a climate-change tipping-points cascade, it’s also the root cause of almost all its other causes. It’s also the root cause of unsustainable habitat loss and pollution. It’s also the root cause of factory farming and industrial fishing, which causes more pain and suffering every year than all other atrocities ever committed combined.
As for corporations, they’re not burning the planet for shits and giggles - they’re psychopaths doing it because billions of people are choosing to buy their goods and services, which they want but don’t actually need.
The crust is minuscule compared to the core and mantle.
The mantle makes up about 84% of Earth’s total volume. The temperature varies from about 1 300 K (1 000°C, 1 832°F) near its boundary with the crust, to 4 000 K (3 700°C, 6 692°F) near its boundary with the core. https://education.nationalgeographic.org/resource/mantle/
The temperature in the Earth’s core is uncertain: estimates at the inner core boundary range from 4 000 K to 8 000 K and at the core–mantle boundary from 3 000 to 4 500 K. https://www.homepages.ucl.ac.uk/~ucfbdxa/pubblicazioni/nat.pdf