You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Saint_Helena

Context:
Between 1791 and 1833, Saint Helena became the site of a series of experiments in conservation, reforestation and attempts to boost rainfall artificially. This environmental intervention was closely linked to the conceptualisation of the processes of environmental change and helped establish the roots of environmentalism.

Question:
What did scientists attempt to boost artificially on Saint Helena?

rainfall