It wouldn't be the first time an island had been terraformed, from Wikipedia, https://en.wikipedia.org/wiki/Saint_Helena https://en.wikipedia.org/wiki/Saint_Hel

It wouldn't be the first time an island had been terraformed, from Wikipedia, https://en.wikipedia.org/wiki/Saint_Helena https://en.wikipedia.org/wiki/Saint_Helena: "Between 1791 and 1833, Saint Helena became the site of a series of experiments in conservation, reforestation and attempts to boost rainfall artificially.[5] This environmental intervention was closely linked to the conceptualisation of the processes of environmental change and helped establish the roots of environmentalism."