Sustainable Development Goal 15, or SDG 15, is about "Life on Land". Its aim is to manage forests sustainably, combat desertification, halt and reverse land degradation, and halt biodiversity loss. The goal recognizes that these are all interconnected issues that require holistic approaches to solve. Forests, for example, are vital to combating climate change, and so sustainable forestry is a key aspect of this goal. Other important steps include promoting the sustainable use of terrestrial ecosystems, ensuring the conservation of mountain ecosystems, and taking urgent action to end poaching and trafficking of protected species.

In addition to these, SDG 15 also emphasizes the importance of integrating ecosystem and biodiversity values into national and local planning, development processes, and poverty reduction strategies. This involves mobilizing and significantly increasing financial resources from all sources to conserve and sustainably use biodiversity and ecosystems.

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Furthermore, SDG 15 also calls for enhancing global support for efforts to combat poaching and trafficking of protected species, including by increasing the capacity of local communities to pursue sustainable livelihood opportunities. This not only helps in preserving biodiversity but also contributes towards sustainable development and poverty reduction.

In essence, SDG 15 underlines the importance of preserving our terrestrial ecosystems and biodiversity, acknowledging that they are critical not just for our planet's health, but also for human well-being and sustainable development.