Col. Chris Hadfield, the Canadian astronaut who became a social media celebrity during his mission aboard the International Space Station in 2013, took to Twitter on New Year’s Eve to offer reasons for optimism in a year where divisiveness dominated the headlines.

“If you refocus on the things that are working, your year will be better than the last,” Hadfield tweeted. Here’s his list of things to be thankful for from the year 2016:

With celebrity death and elections taking the media by the nose, it’s easy to forget that this year saw a great many positives. Let’s look.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

1. The Colombian government and FARC rebels committed to a lasting peace, ending a war that killed or displaced over 7 million people.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

2. Sri Lanka spent five years working to exile the world’s deadliest disease from their borders. As of 2016, they are malaria free.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

3. The Giant Panda, arguably the world’s second cutest panda, has official been removed from the endangered species list.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

4. @astro_timpeake became the first ESA astronaut from the UK, symbolizing a renewed British commitment to space exploration.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

5. Tiger numbers around the world are on the rise for the first time in 100 years, with plans to double by 2022.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

6. Juno, a piece of future history, successfully flew over 588 million miles and is now sending back unprecedented data from Jupiter.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

7. The number of veterans in the US who are homeless has halved in the past half-decade, with a nearly 20% drop in 2016.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

8. Malawi lowered its HIV rate by 67%, and in the past decade have seen a shift in public health that has saved over 250,000 lives.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

9. Air travel continue to get safer, and 2016 saw the second fewest per capita deaths in aviation of any year on record.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

10. India’s dogged commitment to reforestation saw a single day event planting more than 50 million trees, a world record.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

11. Measles has been eradicated from the Americas. A 22 year vaccination campaign has led to the elimination of the historic virus.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

12. After a century, Einstein’s theory of gravitational waves has been proven correct, in a ‘moon shot’ scientific achievement.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

13. China has announced a firm date for the end of the ivory trade, as public opinion is becoming more staunchly environmentalist.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

14. A solar powered airplane flew across the Pacific Ocean for the first time, highlighting a new era of energy possibilities.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

15. Costa Rica’s entire electrical grid ran on renewable energy for over half the year, and their capacity continues to grow.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

16. Israeli and US researchers believe they are on the brink of being able to cure radiation sickness, after successful tests this year.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

17. The ozone layer has shown that through tackling a problem head on, the world can stem environmental disasters, together.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

18. A new treatment for melanoma has seen a 40% survival rate, taking a huge step forward towards long-term cancer survivability.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

19. An Ebola vaccine was developed by Canadian researchers with 100% efficacy. Humans eradicated horror, together.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

20. British Columbia protected 85% of the world’s largest temperate rainforest, in a landmark environmental agreement.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

21. 2016 saw the designation of more than 40 new marine sanctuaries in 20 countries, covering an area larger than the United States.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

22. These marine reserves include Malaysia’s 13 year struggle to complete a million hectare park, completed this year.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

23. This also includes the largest marine reserve in history, created in Antarctica via an unprecedented agreement by 24 nations.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

24. Atmospheric acid pollution, once a gloomy reality, has been tackled to the point of being almost back to pre-industrial levels.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

25. Major diseases are in decline. The US saw a 50% mortality drop in colon cancer; lower heart disease, osteoporosis and dementia.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

26. Uruguay successfully fought tobacco companies to create a precedent for small countries looking to introduce health-focused legislation.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

27. World hunger has reached its lowest point in 25 years, and with poverty levels dropping worldwide, seems likely to continue.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

28. The A.U. made strides to become more unified, launching an all-Africa passport meant to allow for visa-free travel for all citizens.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

29. Fossil fuel emissions flatlined in 2016, with the Paris agreement becoming the fastest UN treaty to become international law.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

30. China announced a ban on new coal mines, with renewed targets to increase electrical capacity through renewables by 2020.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016

31. One third of Dutch prison cells are empty as the crime rate shrank by more than 25% in the last eight years, continuing to drop.

— Chris Hadfield (@Cmdr_Hadfield) December 31, 2016