Adopting a default speed limit of 20mph in residential areas is a successful and growing road safety campaign, but it's also a driver for widespread social progress. Let Danny Dorling explain.
Dr Mark Williamson is Director of Action for Happiness. In his response to the What One Change question Mark asks us to put happiness at the heart of how we lead our lives, and he describes the impact this can have on our politics, our personal lives, our working lives and our communities.
Avy Joseph introduces Rational Emotive Behavior Therapy - a psychotherapy based on the idea that people experience emotional and behavioural problems mainly because they hold self defeating, unhealthy beliefs. In his response, Avy describes the positive impact it offers for common societal issues.
As well as playing the drums in Keane, Richard has been involved in human rights campaign work with Amnesty International, including visiting Troy Davis on death row in 2009. Here, Richard draws on his experiences and his dedication to equality in calling for an end to the death penalty.
Are there single changes that can solve many social problems? Are we listening to the right people? To find out, we're asking "what one change would have the biggest positive impact on society?" Find out more or why not submit your one change.
