[6] She was created a life peer on 31 January 2011 with the title Baroness Worthington, of Cambridge in the County of Cambridgeshire,[7] and sat on the Labour benches, until redesignating as a non-affiliated member in April 2017.

Worthington launched Sandbag in 2008[10] to raise public awareness of and improve the European Union's Emissions Trading Scheme (ETS).

With a general remit to "defend against climate risk",[11] Sandbag now focuses on researching and suggesting improvements to the ETS, how to phase out coal-fired power stations in Europe, and how governments and the EU can work to support carbon capture and storage.

[17] She has said: "The world desperately needs sustainable, low carbon energy to address climate change while lifting people out of poverty.

Thorium based reactors, such as those designed by the late Alvin Weinberg, could radically change perceptions of nuclear power leading to widespread deployment.

"[18] Worthington was patron and trustee of The Alvin Weinberg Foundation, a British non-profit, non-governmental organization dedicated to the promotion and development of molten salt reactor (MSR) technology.