There is a saying that most of modern inventions were created in the last 40 years. In the past, people used candles (and torches) to generate light and it lasted over thousands of years. They never thought that anything else could replace them until Edison invented the light bulb. Nowadays, bulbs have already been replaced by LEDs (light emitting diodes), and people still try their best to improve lighting devices. They suppress the UV band of the light spectrum while focusing more on the infra-red region which wave length is around 650 nm. It's really good for the eyes. Meanwhile, people are concerned about what kind of new things will be created on next year. They wonder if they should buy the latest device or wait for new releases. This is very similar to buying phones. We buy a phone which/that has a lot of new features but a few days later, a new improved version has already been released. This makes everyone feel sad! If we have a look at our lives, all the things and devices we use work on electricity. The discovery of electricity changed the world. The need for electricity increases day by day. How can we hope to create electricity in the future without polluting our environment?

There’s a saying that the inventions created in the last 40 years outnumber all those made before. Ancient people used candles for lighting for thousands of years and never imagined something could replace them—until Edison invented the light bulb. Today, light bulbs are being replaced by LED lights, and people are still working hard to improve them. For example, they’ve removed blue light and UV rays from the spectrum and added more red light with wavelengths around 650 nm, which is much better for our eyes. At the same time, people are wondering what new technologies will emerge next year. Should they buy the latest products now or wait for the next big thing? It’s like buying a phone—you get one with all the latest features, and just a few days later, an improved version is released. It can be frustrating! If we look at our daily lives, nearly everything we use is connected to electricity. Electricity has transformed the world, and the demand for it continues to grow. But how can we generate electricity in the future without harming the environment?

There is a saying that the inventions of the last 40 years are more than all the inventions /those* made before. Ancient people used candles for lighting over /for thousands of years. They never thought [about another thing] /that something (else) could replace candles until Edison invented the light bulb. Nowadays, incandescent light bulbs have already been replaced by LED lights , and people still try (their best) to improve the lights/ them*. They remove the blue ray /wavelengths and UV [rayout] /rays of /from the spectrum, and add more red, [ray] whose wave length are /is around 650 nm. It's really good /better for the eyes. Meanwhile, people are concerned about what kind of new things will be created the next year /in the coming years /in the future. Should they buy one right now or wait for the new arrivals. This is very similar to /when buying phones. We just buy a phone which has a lot of new features, but it is improved (to be better) a few days later. This makes everyone /you feel sad /disappointed ! If we observe our lives, all the things and devices we use are (quite) related to electricity. Electricity changed the world. The need of /for electricity increases day by day. What can we use to create /supply /generate electricity in the future without polluting our environment?

It’s been said that there have been more inventions created in the last 40 years than all previous years. For thousands of years, people used to burn candles for light. They never thought that anything could replace candles until Edison invented the lightbulb. Nowadays, bulbs have already been replaced by LED lights, and people are still trying their best to improve those. They have removed the blue and UV rays out of the spectrum, and added more red rays - whose wave length are around 650 nm. Consequently, it’s much safer for the eyes. Meanwhile , people are concerned about what kind of new things will be created next year. Should they buy something right now, or wait for the new arrivals? For instance, we buy phones which have a lot of new features, but then it gets improved a few days later! This makes everyone feel disappointed ! When we stop and think about it, everything we use is heavily reliant on electricity. Undoubtedly, electricity has changed the world, however, the need for electricity increases day by day. So, I’ll leave you with this question: In the future, how can we create electricity without polluting our environment?