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Robots can collect this data, by placing sensors with uncrewed aerial vehicles (UAVs), perching UAVs, or climbing robots. All require adhesion to substrates with varying roughnesses, from tree bark to concrete and glass. Unfortunately, common adhesion methods are specialized for specific substrates, don't generalize to different surfaces, or leave behind harmful residue. This work presents the novel use of gelatin\u2010based hydrogels as biodegradable and water\u2010soluble adhesives for reversible adhesion to different surfaces for robotic environmental monitoring. The hydrogel adheres through heating, attaching, and cooling. The hydrogel is released by heating again, and any residue can be washed away with water. To correctly dimension the adhesive, factors affecting the maximum pull\u2010off force are experimentally characterized. The versatility of the adhesive is shown through adhesion to different surfaces. Only 0.1\u2009g is shown to support at least 20\u2009N. 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