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Nature, and it's immense diversity make me happy. If living things can produce happiness, it's plausible that more life produces more happiness, and more diversity means more life. Nature isn't doing so well, because of human activity. This means that as a conscious human, being aware of this, we have a duty to change our behavior to remedy the biodiversity crisis.
How bad is the biodiversity crisis
The WWF 2020 report distilled on earth.org paints a grim picture. I'm particularly worried about the decline in living soil and pollinator populations, but this is not the full picture. It is quite clear that agriculture is the highest impact factor in this. When ecosystems collapse, we also risk the productivity of our agricultural systems. This means more land is needed to feed the population using the established agricultural practices. A vicious cycle that we urgently need to break out of.
How can we break the vicious cycle of biodiversity decline
Nature as we know it runs on photosynthesis. Even in on the most barren surfaces, with a bit of help, photosynthesis is possible, and can drive the generation of soil, even out of thin air.