We are researching technologies to achieve carbon neutrality by using CO₂ in the right way. Reducing CO₂ emissions is important, but so is absorbing CO₂. To reduce net CO₂ emissions to zero, we are developing several measures of converting, removing or reusing absorbed CO₂. One of these is algae.

Algae grows by absorbing CO2, and can be converted into bio-fuel.

A lot of energy now depends on fossil fuels. Energy for mobility is one, and much of our electricity is created by burning fossil fuels. Our society is built upon fossil fuel because it is cheap.

Honda also has provided mobility powered by fossil fuels, such as motorcycles, automobiles and jet planes, for the joy and freedom of mobility.

But now, this has to change in response to global warming. We need new technology to change society, and one of those is what we are now researching.

I believe we should electrify where we can. In Honda’s case, it is a multifaceted business with products covering many categories, so it would be challenging to electrify everything we have. Short distance surface mobility such as motorcycles and automobiles are easy to electrify, but high-output mobility such as jet aircraft and boats are more difficult. We still need fuel in areas where electrification is difficult, which means alternative fuels such as synthetic and bio fuels.

Honda manufactures not only motorcycles and automobiles, but boats and jets as well, so we have to think of methods other than electrification.

Honda’s products are used all over the world by various customers. The environment differs completely between developed and developing nations, so we cannot just produce EVs and call it a day. We need to find the right combination of electric, hydrogen, synthetic and bio fuels according to the region and its usage.

Ideally, we should not emit CO₂ at all, but in cases where that is difficult, it would be better to use sustainable fuel in conjunction with capturing and reusing CO₂ to reduce the total environmental impact.

We call it carbon recycling, where we consider CO₂ as a resource that can be recirculated.

For example, capturing CO₂ as it comes out of factories is one method. But capturing 100% of the CO₂ from its source is not practically possible. So we could use Direct Air Capture (DAC) technology to capture the escaped CO₂.

We could bury the captured CO₂, or convert it to fuel.

 Right. So, we are considering how to utilize algae.

I’ll now hand it over to Nozomi, project leader of Honda DREAMO algae.

First, algae is an excellent absorbing agent of CO₂.

Between algae researchers, there is a theory that the reason dinosaurs went extinct was indeed algae. When dinosaurs roamed the Earth, there was an explosive increase in algae, which absorbed all the CO₂ and suddenly increased oxygen. So, that’s why the dinosaurs went extinct. Seriously though, that’s how much algae can absorb CO₂.

DREAMO has a higher cell division speed, which means it grows faster.

In fact, DREAMO cells divide about once every five hours, so on a good day, it can divide five times in a day. This means one algae divides into two, which then divides into four, and eight, and sixteen, and 32, and so on.

Each gram of algae absorbs 2g of CO₂. The more the algae, the more CO₂ is absorbed, so DREAMO, which can divide faster, can absorb more CO₂.

Some algae only multiply once per month. We were focused on CO₂ absorption, so we researched division speed as a priority.

 There are many ways the algae can be utilized. Biofuel and bioplastic resins are quite useful for automobile purposes. We are also considering nutrition supplements, health and beauty supplements, and pharmaceuticals.

Yes, bio plastic is definitely in our scope. The factories keep on telling us they want to make car components soon.

Compared to fossil fuel-derived plastic, algae-derived fuels and resins are more expensive.

That is an issue, but we also think that it could be viable as a business by utilizing everything: using its constituents as ethanol, and whatever remains for food and supplements.

There are many possible uses, so we would like to team up with other related industry partners to expand those possibilities even more.

Thank you. I’m so glad.

Algae has another advantage. It can be grown in a desert, or areas that suffer from salt damage.

Some biofuels are made from sugar cane or corn, but these cannot be grown when there is high salt content in the land, or in a desert. By using a DAC system that condenses CO₂, DREAMO can be cultivated even in a desert or a coastal area.

Our DREAMO is a very tough algae. We have developed a cultivation system that has a higher culture medium reuse efficiency, and can be reused many times over by adding some water (the amount contained in captured algae) and nutrients. We can continue cultivating DREAMO for three months using the same culture medium.

If the land is used to create fuel, instead of being used to create food, we would starve. A big advantage of algae is that we do not have to face that choice.

I joined Honda because I wanted to research algae. I’ve always loved algae. I thought Honda’s challenging spirit would allow me to do this research.

I had a different job when I joined Honda, but I always wanted to research algae, so when I had the chance, I made my case to the CEO. He gave me the green light on the spot.

I started the research alone, but we gradually have more members now.

Two years ago, a research group for CO₂ capture and conversion was set up. Before ourt team had to make our case about CO₂, but now we have strong allies.

We had absolutely no success for the first three years, and we were nearly closed down. But I didn’t want to stop the research, so I found the departments that would need biofuel, and approached all of them.

The Motorcycle Division was the most responsive to us. They made the case to keep us going, telling top management that they needed the technology, and would definitely use it. They were really cool.

Electrification is progressing in the motorcycle industry, but EV bikes would be more expensive. Especially in countries such as India and Southeast Asia where bikes are a necessity of life, there would not be many who could afford EV bikes. I think biofuel would be useful in preventing people from losing their mobility lifeline to the electrification wave.

We work every day to cultivate DREAMO, hot or cold, come rain or shine or snow.

Why? Because DREAMO not only captures CO₂, but can be turned into food, and by creating new jobs in developing nations, may be able to help people who are starving or in need.

I believe that since Honda is making cars that emit CO₂, it is our responsibility to capture CO₂.

With global warming due to more CO₂ in the atmosphere, there will be more natural disasters such as droughts, and people in developing nations will suffer. I want to do what I can, so I can be proud in front of anyone.