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Carbon offsetting is a way to compensate for greenhouse gas emissions by investing in projects that reduce or remove emissions elsewhere. It's a carbon trading mechanism that involves purchasing carbon credits, which represent the reduction or removal of greenhouse gases. 
Here's how carbon offsetting works:

• Offset emissions
  Purchase carbon credits to compensate for your remaining emissions. You can buy carbon credits from a platform like the UN Carbon Offset Platform. 

• Verify emissions reductions
  A third party verifies the accuracy of the emissions reductions from the offsetting project. 

• Sell carbon credits
  The developer of the offsetting project sells the carbon credits, which are then purchased by you or another entity. 

• Calculate emissions
  Use a carbon footprint calculator to estimate your emissions. 
• Reduce emissions
  Take steps to reduce your emissions, such as using public transportation, turning off lights, or switching to more energy-efficient appliances. 

Carbon offsetting is controversial because of concerns that businesses may use it as a substitute for directly reducing emissions. There's also evidence that some carbon offset projects have overstated their ability to reduce emissions, or have caused harm to local communities.