The Trees Around the GLOBE Student Research Campaign, GLOBE European Phenology Campaign, UNEP/GRID-Warsaw Centre (coordinator of GLOBE Poland), and the Urban Heat Island Effect - Surface Temperature Field Program, would like to invite you to participate in the Spring 2022 GLOBE Tree Height and Land Cover Intensive Observation Period (IOP) from 22 April through 22 May 2022. You can participate in the IOP by collecting as many Tree Height and Land Cover observations as you wish, using the traditional GLOBE protocol observations and/or the NASA GLOBE Observer App. This Spring 2022 IOP will be part of the 4th year of the Trees Around the GLOBE Student Research Campaign and will align to the 2022 European Phenology Spring Green Up Campaign, the 25th anniversary of GLOBE Poland, and the 50th anniversary of the United Nations Environmental Program. The IOP will also parallel the 50th anniversary of the NASA Landsat Program, with its 50 years of remote sensing Earth observations, and the NASA Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) mission’s observations of tree height from space. Will you join us in celebrating these milestones by taking vital tree height and land cover observations that will benefit global science research and provide important ground-based data for student and professional researchers?