The average temperature of the Earth is rising, but that's not the only way we can tell the climate is changing. Here are few signs of changes due to global warming:
Greenhouse gases trap more heat in the Earth's atmosphere, resulted in the rise of global average temperatures. These higher temperature can also lead to a chain reaction of other changes in oceans, weather patterns, snow and ice, and plants and animals around the world. The major effects that higher temperatures have on people and the environment are agriculture, energy, water supplies, health, living things, forest related issues.
A drought is an extended period of dry weather caused by lack of rain or snow. As temperatures rise due to global climate change, more moisture evaporates from land and water, leaving less water behind. Some places are getting more rain or snow to make up for it, but other places are getting less.
Sea level rising:
As water gets warmer, it takes up more space. Each drop of water expands by a little bit, but when you multiply this expansion over the entire depth of the ocean, it all adds up and causes sea level to rise. Sea level is also rising because melting glaciers and ice sheets are adding more water to the oceans. Rising sea level is a threat to people who live near the ocean. Some low-lying areas will have more frequent flooding, and very low-lying land could be submerged completely. Rising sea level can also harm important coastal ecosystems like mangrove forests and coral reefs.
Increases Ocean acidity
Carbon dioxideis added to the atmosphere whenever people burn fossil fuels. Oceans play an important role in keeping the Earth's carbon cycle in balance. As the amount of CO2 in the atmosphere rises, the oceans absorb a lot of it. In the ocean, CO2 reacts with sea water to form carbonic acid. This causes the ocean to become more acidic. Increasing acidity will make it harder for corals to build skeletons and for shellfish to build the shells they need for protection. Corals are particularly important because they provide homes for many other sea creatures.
Changing Rain and Snow Patterns
As temperatures rise and the air becomes warmer, more moisture evaporates from land and water into the atmosphere. More moisture in the air generally means we can expect more rain and snow (called precipitation) and more heavy downpours. But this extra precipitation is not spread evenly around the globe, and some places might actually get less precipitation than they used to get. That's because climate change causes shifts in air and ocean currents, which can change weather patterns. Too little or too much water can be a problem. In many places, people depend on rain and snowmelt to fill lakes and streams and provide a source of water for drinking, watering crops, and other uses. However, heavy rain can cause flooding.
The atmosphere affects oceans, and oceans influence the atmosphere. As the temperature of the air rises, oceans absorb some of this heat and also become warmer. Warmer oceans affect weather patterns, cause more powerful tropical storms, and can impact many kinds of sea life, such as corals and fish. Warmer oceans are also one of the main causes of rising sea level.