Open Access makes published research freely available to people without a subscription. The philosophical basis for Open Access is that publicly funded research should be publicly available. In addition, humanity is facing considerable challenges regarding food, water, energy and transport into the future. We need the research community to work together to devise solutions, and excluding a significant number of researchers from the discussion because research output is behind paywalls does not work towards this end goal.
The following image demonstrates some of the benefits of Open Access.