Tropical islands and mountain glaciers get all the attention. But the planet's river deltas are the real front lines of climate change.

Sharing that message is a goal of the Delta Alliance, a new effort by officials in the Netherlands to unite people around the world struggling to manage river delta regions. This includes Thailand, Indonesia, Vietnam, Bangladesh, Nigeria – and California.

Scientists have advised California to prepare for 55 inches of sea level rise in the Sacramento-San Joaquin Delta by 2100. Protecting communities and the Delta freshwater supply, which serves 23 million Californians, will be a complicated and pricey task.

The Dutch have lived below sea level for hundreds of years. They've survived by building massive levees that are the envy of the world.

Last week, a delegation from the Netherlands visited San Francisco and the Delta. One result is a planned September symposium in California on common challenges.

On Thursday, The Bee interviewed Bart Parmet, director of the Deltateam for the Netherlands Ministry of Transport, Public Works and Water Management, during the delegation's stop in Sacramento.

Why did you form the Delta Alliance?

Already 50 percent of the population in the world lives in delta areas, and this will grow up to 80 percent maybe. The problems with the deltas, with rising sea level and changes in river discharges, are similar. That was the background to say, "Hey, why not make an alliance of places to exchange knowledge, do research together and be prepared for this rise in sea level."

We are a nation that is curious. We have a good name in water. We are a nation that doesn't mind selling things. We'd like to combine helping, and if we can benefit from it, too, it's OK.

Does the public understand that deltas may be more vulnerable to climate change than other areas?

Yes, at least in the Netherlands, that's for sure. And I think here, now, growing awareness in California as well. Maybe the Delta Alliance would help to raise awareness of this problem. Because as I understood during our visit, it's not common knowledge with Joe America.

How are deltas more vulnerable to climate change?

Because they are there where the river enters the sea. So with a rise in sea level, they are the first victims, so to say. But they are attractive areas to live in, and that's because there is fertile ground, there is water from the river, there is fish, there is everything you need.

You toured the Sacramento-San Joaquin Delta today. Tell me what you thought.

I heard about the large subsidence of the soils, and that was very clear to see. And I asked myself, where will this end? How will this end?

What I saw, and what I tried to imagine, is the complex government structure you have here. In the Netherlands, all major levees are owned by the government. So it is very clear who is responsible. Here I heard that levees are privately owned. And if the state would improve them, or the Army Corps, they are liable. So: I'm a farmer, I get help from the state, they improve my levee, and after that I can even sue them if things go wrong.

Well, that's strange. So I try to imagine how to work in such a complex situation, which seems very difficult.

What did you think of the levees you saw?

These levees have a quality that would not meet Dutch standards. Although there are also levees built by the Army Corps which do, there are a lot of levees which are old levees on peat soils and those are not the most, let's say, strong levees. It would be huge work to improve them, but if you want to you can.

How do you deal with people who aren't concerned about sea level rise?

We faced the same problem. And we have one advantage, where I think you have also an advantage. If the Netherlands would not be protected at the moment, about two-thirds would be flooded now and then – without sea level rise.

What you have is not only sea level rise. There are more problems. For example, an earthquake, or a storm surge, or a maximum river flow. You already have problems that can cause inundation. You don't need the sea level rise for that. That could help to make the sense of urgency very clear.

Do you have any thoughts about what we should do?

To me, this complex situation of conflicting interests, that's something that really needs to be tackled. In the Netherlands, we are used to doing things together. If we don't do it together, we drown together. So that's simple.

In the Netherlands, there will be a delta fund that will be fed by at least 1 billion euros (about $1.4 billion) per year (from income taxes). It's not a luxury, it's a necessity. And 1 billion euros is a real bargain to protect our country. Because the public was involved, it makes it easier for Parliament (to approve this).

So my advice, modest advice for California, would be to think about a delta fund, so you don't have to argue in the political arena about funds every year. Second: Try one water act or delta act in which you combine all the things you have on water and your delta. That will be a major task.

Sit together, talk about it. Confront people if they don't want to look into interests of other stakeholders. You really have to work together because it's too big an issue to think you can tackle it in the Delta alone or in the Bay Area alone. It's an issue of all California.

Call The Bee's Matt Weiser, (916) 321-1264.