STOCKHOLM, March 21 (Reuters) - A Swedish court gave Greta Thunberg and hundreds of other climate activists the go-ahead on Tuesday to proceed with a class action lawsuit against the Swedish state for "insufficient climate policy". "The Swedish state has three months to respond to the lawsuit before the case could be heard or settled in writing, the district court said, adding it could not say when the suit might be decided. See here for a complete list of exchanges and delays