Each week, we scour the worlds of innovation, tech for good and social impact to bring you seven of our top stories…

1. The Independent reports that tech-savvy Ukrainians are teaming up on websites and apps to help people fleeing the war, getting rides away from the frontline and finding safe places to stay.
2. The BBC’s People Fixing the World podcast speaks with the inventor of a flat-pack solar water heater that could reduce emissions and improve the quality of life for millions of people.
3. Nesta Challenges’ Tris Dyson explores how challenge prizes could be used to unlock innovation in everything from clean energy to dementia care.
4. Researchers warn that the Amazon rainforest is reaching a “tipping point” where it will be unable to recover from the damage caused by logging, fires and drought.
5. VC investment in companies tackling climate change has increased by 62% in the 100 days since COP26 according to new findings from Tech Nation.
6. As global fuel prices surge, sales in Tesla’s electric vehicles have jumped.
7. Children undergoing treatment at Sheffield Children’s Hospital are being entertained and soothed by a gaggle of robot companions.