- Life Cycle Environmental Activities
Reducing Environmental Impact During Driving and the Entire Vehicle Life Cycle
The Mirai has the potential to achieve a significantly lower life-time environmental burden compared to gasoline-powered and hybrid vehicles, depending on hydrogen production techniques. Significant reductions can be achieved if an efficient means of producing hydrogen using renewable energy sources arises in the future.
Toyota uses a comprehensive evaluation technique called "LCA" (Life Cycle Assessment), whereby a vehicle's impact on the environment is measured at all stages, from resource extraction to disposal and recycling.
Evaluations are based on the assumption that each vehicle travels 100,000 km over a 10-year period under the JC08 test cycle. LCA results are shown as an index. The environmental burden of the hydrogen used by a fuel cell vehicle differs according to the production method. Current "Driving (fuel production)" emission figures for fuel cell vehicles are calculated based on the assumption that they use hydrogen obtained as a by-product of the sodium hydroxide production process.
The the Mirai's Comparative Life Cycle Assessment results were certified by TÜV Rheinland, in accordance with ISO14040/14044 standards.
The Mirai is manufactured in a way that aims for plant sustainability, fully utilizing natural resources while operating in harmony with the natural environment from the following three viewpoints.
- Effective energy generation
- Utilize exhaust heat from plants or renewable energy such as solar power
- Eliminate energy waste
- Develop and introduce low CO2-emitting production technologies and daily kaizen activities
- Community involvement and ecosystem conservation
- Conduct tree planting at plants
Environment centers burn certain waste products emitted from plants, generating electricity/steam and recycling these products as an energy source.
Toward a sustainable energy-based society
Toward a sustainable energy-based society that uses hydrogen
Hydrogen can be produced from various primary energy sources suited to each country/region. Hydrogen is also playing a major role in the spread of renewable energy. Solar and wind power are affected by weather conditions, resulting in unstable power generation, which makes indefinite storage difficult. One way to overcome these challenges with such energies is to convert the energy to hydrogen, which has a higher volumetric energy density than batteries, for storage. Going forward, society must utilize renewable energy, and optimally integrate the electricity grid with the hydrogen grid for effective use.
FC stack and battery recycling in Japan
Paving the way, led by state-of-the-art technology
Precious metals (a world first*1)
Fuel cell stacks equipped in Mirai vehicles contain precious metals. We will further facilitate resource recycling by developing the world's first stack collection and recycling framework in line with the launch of the Mirai.
Recycling (a world first*1)
The Mirai has an overall 99 percent recovery rate*2. We succeeded in creating the world's first battery-to-battery recycling (reusing old batteries in new battery components) in 2010.
In 2013, we began reusing batteries as secondary batteries for stationary use in buildings and offices in another world first.
We repeatedly reuse precious resources to contribute to a sustainable future.
|*1||As of December 2014, research conducted by Toyota Motor Corporation|
|*2||Compared to whole vehicle weight in Japan (recovery rate is based on the Japanese definition)|
Prius PHV Life Cycle Environmental Activities
Meeting the Achieve-Zero Challenge
20% reduction of CO2 emissions during driving
"New Vehicle Zero CO2 Emissions Challenge"
The Prius PHV, developed as the mainstay of our next-generation vehicles, reduces CO2 emissions by 20 percent compared to the previous model. A reduction in emissions of 77 percent can be achieved by using renewable energy for plug-in charging.
5% CO2 Emissions Reduction in Life Cycle Assessment
"Life Cycle Zero CO2 Emissions Challenge"
At Toyota, zero CO2 refers not only to emissions during driving, but all CO2 emissions, including the manufacturing process, from material production through to the disposal and recycling of vehicles.
Toyota's LCA method, which is applied to our passenger vehicles, was certified by TÜV Rheinland, in accordance with ISO14040/14044 standards.
Eco-friendly Vehicles Produced at Eco-friendly Plants by Eco-minded People
"Plant Zero CO2 Emissions Challenge"
The plants that manufacture the new Prius PHV is have reduced CO2 emissions by introducing low-CO2 emitting production technologies and improving efficiency by streamlining processes. For example, new technology implemented in the painting process has enabled lower emissions.
CO2 emissions are also reduced owing to the installation of a-2,000 kW output photovoltaic system (sufficient to provide power for some 500 households).
Net Positive Impact Challenge
Return Clean Water to Local Sources
Minimizing and Optimizing Water Usage
Toyota Prius PHV production plants have established stringent standards, aiming to return cleaner water to local water sources. A biotope that supports indigenous species such as Japanese rice fish, crucian carp, and dragonfly has been created with the aim of raising awareness of biodiversity, conservation, and the utilization of treated wastewater.
Car-to-car, a New Form of Resource Recycling
Establishing a Recycling-based Society and Systems
The magnets used in HEV motors contain neodymium and dysprosium, two kinds of rare-earth elements. Toyota has also launched a car-to-car recycling system for extracting these elements from end-of-life HEV motors to be recycled into new magnets, in collaboration with magnet manufacturers.
Tree Planting at Production Plants
Establishing a Future Society in Harmony with Nature
Tree-planting activities began at the new Prius PHV production plants in 2008 with the motto 'Make our plant rich in trees!'. A total of 5,000 people including employees, their families, and members of the community are making strides toward planting 50,000 trees, including conducting research on indigenous tree species and growing saplings from seeds.