Stock Photo - 17 March 2020, Berlin: Max Wolf waters plants in a greenhouse of the August-Heyn gardening school as part of a voluntary ecological year. Berlin's oldest gardening school has existed for 100 years. Every year it brings nature closer to around 30,000 children. (to ""Gardening schools: A piece of nature for city children"") Photo: Carsten Koall/dpa. - Berlin/Berlin/Germany

Stock Photo: 17 March 2020, Berlin: Max Wolf waters plants in a greenhouse of the August-Heyn gardening school as part of a voluntary ecological year.

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