This means you should try to volunteer only in ways that cost an organisation relatively little. For example by contributing high-quality work to Wikipedia, you can provide a significant benefit to many people at almost no cost to others. Some organisations also have opportunities that are designed to take on board volunteers with little cost. Mercy for Animals, for example, is a vegetarian advocacy organisation. It has volunteers contact people who have commented on videos on factory farming on Facebook. These volunteers then discuss the option of going vegetarian with them. This provides a
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