Last week, temperatures in several parts of the world topped 120 degrees Fahrenheit, including here in the U.S. We broke global temperature records three days in a row. In some places, nighttime lows stayed above 100 degrees Fahrenheit. We seem to be entering the period climate scientists have warned us about for decades – rapidly increasing temperatures, more severe storms and prolonged droughts.

In Central America, where corn was first cultivated over millennia and is still the home of many important seed bases, a drought is entering its second decade. It is possible that agriculture will soon be impossible there, along with many parts of Africa and Asia. Rising sea levels will mean many low-lying islands will disappear, and coastal cities will be forced to retreat or be swamped.

All of this means that much of the world’s population will be on the move, searching for a way to survive. Estimates top 1 billion people by mid-century. Here in Portland, we are already seeing previously unimaginable levels of immigration, with hundreds of recent arrivals sleeping in a sports arena, and housing shortages and rising rents forcing many new and established Mainers into the many homeless encampments dotting the city. And we are just getting started.

There are no walls high enough to keep out people desperate for a safe place for them and their families. So we can either spend the precious time that remains on a futile, and cruel, effort to keep people out, or we can prepare for them in a humane way that could have enormous benefits for all of us, new and old Mainers alike.

The first step is housing, and plenty of it. Multi-family housing in Maine has undergone a sea change in recent years. We can build healthy, functional housing with very low heating and cooling loads for much less than all the mediocre, drafty single-family houses we currently build. Greater Portland is home to much of the most expensive real estate in the state, but imagine if we could have planned development surrounding some other cities, like Bangor or Lewiston. Or even smaller population centers like Skowhegan, Farmington or Rumford. We are a sparsely populated state with an aging population – immigrant families could revitalize many parts of the state. In addition to the workforce we desperately need, they would bring children to boost shrinking school enrollments, new cultures and foods, and new outlooks. And of course it would be a big boost to the economies of parts of the state that haven’t always shared in the boom.

Next is finding work for people. We have already seen many immigrants going into health care, and our aging U.S.-born population will only need more services. Some Africans have taken up farming, helping revitalize that economy. In southern Maine, Central Americans are increasingly showing up in construction, where a 20-year-long labor shortage has created enormous demand. And many people show up with important professional skills, needing only some help with language and certifications to resume careers as doctors, engineers, teachers, administrators, etc. Of course we need to reform the work rules, to allow people to find employment much sooner.

It was disappointing to read of the events in Unity. Imagine using this existing, underutilized infrastructure for temporary housing! How many of these new arrivals might see central Maine as a safe, friendly place to establish their new lives?

I am a new Mainer myself, having only lived here for 35 of my 59 years, but my kids can trace their lineage in Maine and Quebec for over 300 years on their mother’s side. As the son of a refugee from the Nazis, I am perhaps more sympathetic to the plight of today’s refugees than others are, but I hope that we can see this as an opportunity to invest in our state, and to demonstrate basic humanity toward people who just want to live.

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