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:
John_Kerry

Context:
Kerry and his second wife, Mozambican-born businesswoman and philanthropist Maria Teresa Thierstein Simões Ferreira (known as Teresa), the widow of Kerry's late Pennsylvania Republican Senate colleague Henry John Heinz III, were introduced to each other by Heinz at an Earth Day rally in 1990. Early the following year, Senator Heinz was killed in a plane crash near Lower Merion. Teresa has three sons from her previous marriage to Heinz, Henry John Heinz IV, André Thierstein Heinz, and Christopher Drake Heinz. Heinz and Kerry were married on May 26, 1995, in Nantucket, Massachusetts.

Question:
When did Kerry and Teresa meet?

1990