Climate change is a change in the long-term global temperature normal, or average, due to an increase in greenhouse gasses in the atmosphere and land use changes that are causing the average global temperature to rise. Since the end of the last glaciation period, the Earth’s climate has remained in a relatively stable and balanced state but it is shifting out of that balance. Over 97% of climate scientists agree that climate change is occurring due to human activities.
What does the Mean for Saint John?
Local and regional climates will respond differently to global warming based on the unique set of geographic conditions in each area. For example, Saint John has cooler summers and warmer winters than Fredericton because of its location on the coast; therefore, climate change will affect each of these cities in different ways. The Climate Change Secretariat of the Government of New Brunswick has released New Brunswick’s Future Climate Projections: AR5 Data and Maps to help communities understand local changes and prepare for impacts over the course of this century. These local projections were developed from the Intergovernmental Panel on Climate Change’s projections in the Fifth Assessment Report (AR5).
Impacts in Saint John
Climate change is expected to have a range of impacts in Saint John. The temperatures in New Brunswick are expected to rise faster than global temperatures. The average temperature has already increased by 1.1°C in the last 30 years and is expected to rise by 2-3°C by 2050 as compared to the period from 1961-1990. The impacts for Saint John due to these increases are as follows:
Increased annual and seasonal temperatures leading to more variable weather patterns
Higher coastal water levels, increased erosion, and more frequent storm surges
An overall increase in annual precipitation with more frequent extreme rainfall events, as well as times of drought, leading to flooding and fluctuations in surface and ground water levels
Increased stress on ecosystems including wildlife, birds, marine life, and vegetation
Increased risk to public safety and infrastructure
International Panel on Climate Change. (n.d.). Fifth assessment report website. Retrieved from https://www.ipcc.ch/report/ar5/
National Aeronautics and Space Administration. (2017). Scientific consensus: Earth’s climate is warming. Retrieved from https://climate.nasa.gov/scientific-consensus/
New Brunswick Department of Environment and Local Government. (2017). How is climate change affecting New Brunswick? Retrieved http://www2.gnb.ca/content/gnb/en/departments/elg/environment/content/climate_change/content/climate_change_affectingnb.html
Roy, P. and Huard D. (2016). Future Climate Scenarios - Province of New-Brunswick. Montreal: Ouranos. Retrieved from http://acasav2.azurewebsites.net/
World Meteorological Organization. (2016). Press release: WMO confirms 2016 as hottest year on record, about 1.1°C above pre-industrial era. Retrieved from https://public.wmo.int/en/media/press-release/wmo-confirms-2016-hottest-year-record-about-11%C2%B0c-above-pre-industrial-era