No garden or park. Only natural forest can do . In garden and parks trimming, chemcals used for insecticide, fertilisation, some stuctural works and its maintenance will cause, increase and invite more and more carbon addition atmoshphere. Trimmed leves and brches will decompose rapidly and will result addition exta carbon. The prduction and utilisation of insecicide and fertiliser will create carbon addition with some other toxic chemicals .

Planting hemp will help also

Thoughtful approach to tree planting ... Planting natural forests sequesters carbon, but when monoculture reforestation harvests those trees, that increases carbon and adds to global warming. Tree planting definitely needs to be incentivized to get people to reduce carbon.