What is climate change?
Climate change — also called the climate crisis — is one of the most significant environmental problems of our time, and it has a wide impact on both natural ecosystems and people’s living conditions. It refers to long-term changes in the earth’s climate, especially in temperatures, rainfall and weather phenomena, driven mainly by human activity. This article looks at the causes, consequences and possible solutions of climate change.
Causes of climate change
The main driver of climate change is the build-up of greenhouse gases such as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) in the atmosphere. These gases trap heat and prevent it from escaping into space, leading to global warming. Their concentrations have increased significantly since the start of industrialization. The main sources of greenhouse gas emissions are:
- Burning fossil fuels such as oil, coal and natural gas for energy production and transport.
- Deforestation and land-use changes, which reduce the planet’s natural carbon sinks.
- Emissions from agriculture, such as methane from livestock farming and the use of fertilizers.
- Industrial processes and waste treatment.
Consequences of climate change
Climate change has many serious consequences that affect both the environment and people. Key effects include:
- Temperature rise: The earth’s average temperature has risen by about 1.1 degrees Celsius since pre-industrial times, driving many of the other changes below.
- Glacier melting and sea level rise: Global warming causes glaciers and polar ice caps to melt. Combined with the thermal expansion of seawater as it warms, this raises sea levels and threatens coastal areas and island nations.
- Extreme weather events: Climate change increases the frequency and intensity of extreme weather such as heatwaves, hurricanes, floods and droughts.
- Changes in ecosystems: Many animal and plant species must adapt to changing conditions, which can lead to habitat loss and species extinction.
- Effects on human health: Climate change can increase health risks such as heat stress, respiratory diseases and the spread of infectious diseases.
- Effects on livelihoods: Agricultural productivity can decline, and extreme weather events can cause economic losses and displacement.
Solutions to combat climate change
Combating climate change requires large-scale, coordinated action at every level. Key measures include:
- Use of renewable energy: Switching from fossil fuels to renewable sources such as solar, wind and hydropower is a key way to cut greenhouse gas emissions.
- Improving energy efficiency: Increasing energy efficiency in buildings, industry and transport reduces both energy consumption and emissions.
- Protecting and restoring forests: Forests act as carbon sinks that absorb carbon dioxide from the atmosphere, so protecting and restoring them helps curb climate change.
- Climate policy: International agreements such as the Paris Agreement, together with national climate strategies, are key tools for coordinating action between countries.
- Sustainable everyday choices: Individuals and communities can help by reducing energy use, favoring public transport, recycling and cutting waste.
Combating climate change is a shared challenge that requires international cooperation and commitment, but with coordinated action at every level it is possible to build a sustainable future.
Read more about climate change and combating it from the following sources:
IPCC (Intergovernmental Panel on Climate Change)
Ilmasto.org
Ympäristö.fi – Climate change
