The MIRAI has the potential to achieve much lower life-time environmental burden compared to gasoline-powered and hybrid vehicles, depending on its hydrogen production techniques. Significant reduction can be achieved if an efficient means of hydrogen production using renewable energy sources becomes available in the future.
Toyota uses a comprehensive evaluation technique called “LCA” (Life Cycle Assessment), whereby a vehicle’s impact on the environment are 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 emission figures of “Driving (fuel production)” 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 result of MIRAI's Comparative Life Cycle Assessment was certified by TÜV Rheinland, in accordance with ISO14040/14044 standards.
MIRAI is being manufactured at the sustainable plant which aims to fully utilize natural resources while operating in harmony with the natural environment from the following three viewpoints
[Effective energy generation] Utilize exhaust heat from the plants or renewable energy such as solar
[Eliminate energy waste] Development and introduction of low CO2 -emitting production technologies and daily Kaizen activities
[Community involvement and ecosystem conservation] Tree planting activity at plants
Environment center burns the partial waste which has been emitted from plants, generates electricity / steam, and recycles as energy source.
Hydrogen can be produced from various primary energies considering the method that meets situation in each country. It can also play a major role in the spread of renewable energy. Solar and wind power are affected by weather conditions, resulting in unstable generation, which makes indefinite storage impossible. However, one way to make it possible to use such energies is to convert the energy to hydrogen, which has higher volumetric energy density than batteries for storage. The society of the future must utilize renewable energy, and optimally integrate the electricity grid with the hydrogen grid for effective use.
Precious metals with scare value is used in fuel cell stack loaded on MIRAI. We will further facilitate resource recycling by formulating the world’s first stack collection and recycling framework for our future in line with MIRAI sales.
Recovery rate in the entire MIRAI is 99%.*2 Especially for driving battery, we have succeeded in the world first battery material recycling, “battery to battery” in 2010.
Furthermore, from 2013, we reused the battery as a secondary battery for stationary use in the building and office far ahead of any competitors.
We repeatedly reuse the precious resources for our future.
New Vehicle Zero CO2 Emissions Challenge
Prius PHV, developed as the mainstay of our next-generation vehicles, reduces CO2 emissions by 20% compared to the previous model. Furthermore, 77% of emissions reduction can be realized by using renewable energy for plug-in charging.
Life Cycle Zero CO2 Emissions Challenge
For Toyota, zero CO2 refers to not only the emissions from driving phase, but all CO2 emissions including the process, from material production until 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.
Plant Zero CO2 Emissions Challenge
The plant where the new Prius PHV is manufactured, reduced CO2 emissions by introducing low-CO2 emitting production technologies and improving efficiency through simplification and streamlining of our processes. For example, new technology in the painting process has enabled lower CO2 emissions.
The plant is also reducing CO2 emissions by installing a-2,000 kW output photovoltaic system (sufficient to provide power for some 500 households).
Challenge of Minimizing and Optimizing Water Usage
The plant establishes more stringent standards than governments’, aiming to return cleaner water to the local river. A biotope where indigenous species such as Japanese rice-fish, Crucian, and Dragonfly are raised, is created with an aim to community interaction and biodiversity conservation, and is utilizing treated wastewater.
Challenge of Establishing a Recycling- based Society and Systems
The magnets used in HV motors contain neodymium and dysprosium, two types of rare-earth elements. Toyota has also launched a car-to-car recycling system for extracting these elements from end-of-life HV motors to be recycled into new magnets, in collaboration with magnet manufacturers.
Challenge of Establishing a Future Society in Harmony with Nature
Tree-planting activities started at the new Prius PHV producing plants in 2008 under the slogan ‘Let us make our Plant rich in trees!’. A total of 5,000 people including employees, their families, and members of the community together planted 50,000 trees. This is ongoing activity including researching on the indigenous tree species and growing saplings from seeds.