Restorative justice can help foster the well-being of people because it prioritizes the needs of everyone involved in a crime in a healthy way. Victims, offenders, and community encounter each other and try to repair. Victims experience care for their needs, vindication, safety, and regaining control over their lives. Offenders experience forgiveness. The community is able to support and integrate the others and it is supportive for them as well. Then transformation through healing can take place. In a penal system, the punishment is important and does not help the offender understand the consequences of the crime or subsequently help the victim with healing.
When healthy healing happens, we have more capacity to take care of our planet and can understand the importance of this. When vulnerability and openness is fostered, we can be more mindful.

Environmental degradation most commonly affects BIPoC people, people with a migration background, and people with low income in Germany. They are often affected by heat waves and pollution because, due to systemic racism, they are often forced to live in areas with more environmental and health risks. Sinti*zze and Rom*nja people are often at risk in Germany. For instance, there have been cases where they are offered land as "reparation" that was in fact a former landfill full of pollutants.
Although there are cases of one person's racism such as not renting your apartment to BIPoC people, it's often systemic also and based on historic policies. There are policies like the National Action Plan Against Racism and the German Sustainable Development Strategy, but what can I do? I would say, don't be racist. There are some anti-racist and human rights groups in my city that are open for new members. I can also inform people about environmental racism and injustice, and take part in the current demonstrations against this.

We can all benefit from constructive communication because deep listening helps people to be relieved from suffering and heal from harmful experiences, and constructive communication helps to avoid misunderstandings and make sure everyone feels valued while being clear and concise.
Problem oriented: focus on problems and not people, so say that this topic is not on the agenda instead of saying you're off topic
Congruent: be honest
Descriptive: describe the problem and don't evaluate such as saying something screwed up. describe what went wrong without saying good or bad.
validating: find points of agreement to help others feel heard.
specific about what happened versus global
conjunctive: let others speak and don't have long pauses and topic switches
own your mistakes
listen!
say I feel ... when ...

Water quality is not really a problem where I live as we have strict regulations regarding pollutants. But you may have pipes in your house that are still made of lead. In Munich, however, despite regulations and high quality water, lead or chemical contamination (pesticides, PFAS/PFOA) is a risk due to old infrastructure and agricultural and production practices. So it's recommended to use a filter, and regardless of the city, pay attention to whether your pipes are made of lead and switch them out in this case. Lead poisoning is a serious problem.
Air quality is good here, but Germany ranks just 25th in the world and there are still deaths and physical and mental health problems caused by air pollution as well as soil acidification. Reasons for this are industry, road traffic, agriculture,... A speed limit on motorways would help to combat this problem. The good news is air quality has improved over the years and also more renewable energy would be a great way to continue this trend, but the government seems to be moving away from this.

I live in Germany and didn't find a lot of information about voter suppression here. I don't think it is a big topic here and it's likely not as present. The requirement for voting is a German citizenship and it's recommended to bring a passport and ID, which I can imagine could be difficult for some people but it is required to have an ID as an adult here anyway. Voting can be difficult if you have a disability but you have the right to request an accessible polling station.
I am originally from the US, however, and there is a lot of voter suppression going on there. On social media, it is easy to find misinformation and be discouraged from voting, especially due to posts targeting specific groups. It would be important for companies to pass fact-checking laws. In California, voter suppression including for voters from abroad is comparatively low.
In my opinion, the provision of the Voting Rights Act struck down in Holder v. Shelby County must be reestablished to prevent voter suppression due to policies. Voter suppression includes: policies requiring proof of citizenship and other registration restrictions as well as voter ID laws, arbitrary requirements and criminalization of the ballot box, felony disenfranchisement, voter purges, and redistricting and gerrymandering. Voter fraud in the sense of saying you are someone else and voting under there name is very rare, only about 3%, whereas double voting or absentee ballots are bigger problems. I understand that it is important to prevent fraud but suppression and discrimination are not the solution.