"Death is not extinguishing the light; it is putting out the lamp because the dawn has come."
- Rabindranath Tagore, Hindu Leader & author
Here are some vetted and recent links that may help you.
Cremation and the Environment:
The Environmental Toll of Cremating the Dead - National Geographic https://www.nationalgeographic.com/science/2019/11/is-cremation-environmentally-friendly-heres-the-science/
How to Make Cremains Safe for Soil:
Planting With Cremains – Is There A Safe Way To Bury Ashes? https://www.gardeningknowhow.com/garden-how-to/info/is-there-a-safe-way-to-bury-ashes.htm