Let's start with waste reduction

In the “Yokohama 3R Dream (Slim) Plan (Yokohama City General Waste Treatment Basic Plan)” formulated in January 2011, the total emissions (total amount of garbage and resources) will be reduced by 10% or more compared to FY2009 (2009) by FY2025, and reduce greenhouse gases emitted from waste disposal by 5% or more by FY2020 (2) by FY20.
As a future city of SDGs, while promoting initiatives for dewarming throughout Yokohama City, efforts to dewarming are also important in the field of waste, so cooperation with Yokohama City's global warming countermeasures plan We have set greenhouse gas reduction targets.

For the actual results of greenhouse gas emissions, see the page on "Greenhouse gas emissions from waste disposal".

Greenhouse gas emissions in the targets of the “Yokohama 3R Dream (Slim) Plan” are calculated by adding the reduction effect of garbage power generation to the calculation method of the local government action plan system based on the Act on Promotion of Global Warming Countermeasures. .
The following is the concept of estimating greenhouse gas emissions in each process.

• We calculate the amount of greenhouse gases emitted from collection vehicles when Yokohama City collects garbage and recyclables from homes. This is calculated based on the amount of fuel used and mileage of collection vehicles.
• We calculate the amount of greenhouse gases equivalent to the amount of electricity and gas used at facilities such as collection offices, incineration plants, and resource sorting centers related to waste disposal.
• The amount of greenhouse gases generated when burning garbage at incineration plants is calculated from the amount of burnable garbage.
• Incinerators use the heat generated when burning garbage to generate electricity, and sell surplus power. Selling electricity to electric power companies, etc., leads to a reduction in greenhouse gas emissions, such as reducing the use of fossil fuels when power companies generate electricity. This reduction is calculated.

The amount of waste generated by incineration of waste accounts for the majority.

Most of the greenhouse gases generated when incinerating garbage are carbon dioxide generated from plastics and synthetic fibers made from fossil fuels. In particular, the incineration of plastics accounts for the majority.
In addition, carbon dioxide is generated when paper, kitchen garbage, and plants are incinerated, but because it is derived from carbon dioxide absorbed from the atmosphere during the growth process of plants, it is not included in greenhouse gas emissions, as absorption and incineration emits less than zero.
In addition, the act of incinerating garbage regardless of the type of garbage such as plastic or kitchen garbage generates greenhouse gases other than carbon dioxide (methane, nitrous oxide). These gases usually produce very small amounts of carbon dioxide, but have a more powerful greenhouse effect than carbon dioxide. Reducing waste from paper, kitchen garbage, vegetation, etc. leads to a reduction in the amount of methane and nitrous oxide generated. In addition, it also reduces the carbon dioxide generated when transporting them (such as those derived from the driving of collection vehicles).

Some burnable garbage are still burned without being separated.
In particular, make sure that plastic containers and packaging and PET bottles, which are plastics that emit a large amount of greenhouse gases by incineration, are thoroughly separated. Please see page of "garbage composition investigation" about classification cooperation rate indicating ratio that recyclable garbage was sorted correctly.