[Environmental Science Popularization] Decoding: Environmental Knowledge Around Us

Air conditioner

1. Air conditioners draw high inrush currents during startup, and frequent on/off cycles not only consume excessive power but also risk damaging the compressor. To prolong the appliance's lifespan, avoid intermittent operation.

2. After running the air conditioner for a few hours, immediately switch on the electric fan. Using this method at night can eliminate the need to keep the air conditioner on all night, saving nearly 50% of electricity while also benefiting health. Position the fan below the indoor unit of the air conditioner, as the fan's airflow can enhance cooling efficiency. Set the air conditioner to dehumidification mode, which maintains a cool sensation even when the room temperature is slightly higher and consumes less electricity compared to cooling mode.

Washing machine

In the same washing time, the motor start-up times are more when the washing machine is working in low speed, which means that the use of high speed is actually more energy-saving than low speed, and can prolong the life of the washing machine.

The dehydration rate can reach 55% when the dehydration time is 1 minute at 1680 rpm (applicable only to turbine type). Generally, the dehydration time should not exceed 3 minutes, and further prolongation of the dehydration time is of little significance.

Microwave oven

To reduce the frequency of turning on and off the microwave oven when thawing food, the food can be pre-transferred from the freezer compartment to the refrigerator compartment, thawed slowly, and then placed in the microwave oven.

Computer

When not using the computer for a short time, enable the 'sleep' mode to reduce power consumption to below 50%.

Turn off unused programs and peripheral devices such as speakers and printers, and minimize the simultaneous operation of hard drives, floppy disks, and optical discs. Reducing the brightness of the monitor can also help lower power consumption.

When using a laptop, pay special attention to: Ensure the battery is fully discharged. Avoid using external devices. Turn off unused devices and ports, and disable screen saver.

Select the shutdown method wisely, and use 'standby' when immediate recovery is required.

The power consumption can be reduced by 40% when the battery is selected in "sleep" mode or "off" mode for a long time.

Gas

Cooking over high heat takes less time than low heat, which can reduce heat loss. However, the flame should not extend beyond the bottom of the pot to avoid wasting gas.

In summer, when temperatures are high, do not cover the kettle before boiling water. Allow the water, which is cooler than the air, to exchange heat with the air. Once the water naturally warms up to the air temperature, then cover it to boil the water. This practice can save gas.

Prior to cooking, thoroughly dry any remaining water droplets on the pot's exterior. Foods that can be boiled should preferably avoid steaming methods. For hard-to-cook items, use a pressure cooker or non-stick stainless steel pot. Additionally, preheating food in a microwave oven can also contribute to gas conservation.

Emission reduction

1. Buying a small-displacement car

A vehicle's fuel consumption typically increases with its engine displacement. For example, a 1.3-liter engine can save 294 liters of fuel annually compared to a 2.0-liter engine, while reducing CO2 emissions by 647 kilograms. If all newly sold passenger cars in China (approximately 3.8289 million units) had an average displacement reduction of 0.1 liters per year, this would save 160 million liters of fuel and cut CO2 emissions by 354,000 tons.

2. Replace plastic bags with cloth bags

While reducing plastic bag usage by just one bag saves approximately 0.04 grams of standard coal equivalent (SCE) and cuts CO₂ emissions by 0.1 grams, the massive daily consumption means that a 10% nationwide reduction could save around 12,000 tons of SCE annually and reduce CO₂ emissions by 31,000 tons.

3. Reduce the use of disposable chopsticks

As a populous country, China's extensive use of disposable chopsticks leads to substantial consumption of forestry resources. A 10% reduction in the national usage of disposable chopsticks would result in an annual equivalent reduction of approximately 103,000 tons of carbon dioxide emissions.

4. Minimize elevator use

Currently, the annual electricity consumption of elevators nationwide is approximately 30 billion kWh. By implementing measures such as converting staircases to lower-floor access and partially activating multiple elevators during rest periods, approximately 10% of elevator electricity consumption can be reduced. Consequently, each elevator can save 5,000 kWh of electricity annually, resulting in a corresponding reduction of 4.8 tons of carbon dioxide emissions.

Achieving energy conservation and emission reduction requires collective efforts, with specific methods extending far beyond these. Actively acquiring environmental science knowledge facilitates more effective participation in environmental protection activities.