Picaridin repels insects, ticks and chiggers. It is a synthetic compound first made in the 1980s. It was made to resemble the natural compound piperine, which is found in the group of plants that are used to produce black pepper. Picaridin has been widely used as an insect repellent in Europe and Australia, but has only been available in the United States since 2005.
Plants have run the biological carbon cycle for 3 billion years in the ocean, and for the past 400 million years on land, using the process of photosynthesis to convert atmospheric CO2 into carbon-rich carbohydrates and sugars to feed themselves. And they are very good at it.
You wonât find it in your kitchen or bathroom: Carbon sinks are natural systems that suck up and store carbon dioxide from the atmosphere.The main natural carbon sinks are plants, the ocean and soil.Plants grab carbon dioxide from the atmosphere to use in photosynthesis; some of this carbon is transferred to soil as plants die and decompose.The oceans are a major carbon storage system for carbon dioxide.lants grab carbon dioxide from the atmosphere to use in photosynthesis; some of this carbon is transferred to soil as plants die and decompose. The oceans are a major carbon storage system for carbon dioxide.