The baying mob in full cry, circling alleged perpetrators of great wrongs, is not a pretty sight. Sudden swarming, like nests of disturbed wasps, is bad both for corporate and political decision-making, and for justice. In an era of 24/7 news-channels, internet and social media, the potential for swarming is dramatically magnified – as we have seen in the last three weeks.

Recently The Economist ran the cover story "Welcome to the Anthropocene – Geology's new age."

"Rather than placing us still in the Holocene, a peculiarly stable era that began only around 10,000 years ago, the geologists say we are already living in the Anthropocene: the age of man."

For many years, ABN AMRO Brazil was a leading exponent of sustainability. Happily, now that it has become part of Banco Santander in Brazil, the tradition continues. As well as seeking to become a more sustainable business itself, Santander Brazil has regularly been running sell-out, day-long workshops for its business customers to learn from the bank's experience in embedding sustainability.

On Thursday Rachel Barton and thousands of other Marks and Spencer staff across Britain will be hoping that you will take your used Marks and Spencer clothes back into a Marks and Spencer store.

Corporate CEOs are busy people. Their time is at a premium. They have to focus on the most important things. When it comes to ensuring that sustainability and responsibility are becoming embedded in their business, one of the most important things they can do, is to have some "crucial conversations."

"Business schools need to teach students more about sustainability." I have lost count of the number of times I've heard this declaration from business leaders around the world.

My Guardian article about recycling scheme in a Housing 21 extra-care court

Jo da Silva is a social intrapreneur. A social activist who absorbed her parents' strong sense of community, coupled with a deep sense of compassion cultivated through early travels in Turkey, the Middle East and India, Jo is committed to developing and applying her engineering skills to solving societal problems.