6. Bibliography and Acknowledgements

National Environment Agency (updated daily) 24 hour PSI Readings for Singapore. Retrieved from http://app2.nea.gov.sg/psimonthly.aspx

Carbon footprint on Wikipedia. Retrieved from http://en.wikipedia.org/wiki/Carbon_footprint.

References:
1. Wright, L., Kemp, S., Williams, I. (2011) 'Carbon footprinting': towards a universally accepted definition. Carbon Management, 2 (1): 61-72.

2. UK Carbon Trust (2008) "Carbon Footprinting".

3. Parliamentary Office of Science and Technology POST (2006). Carbon footprint of electricity generation. October 2006, Number 268

4. Wiedmann, T. and J. Minx (2008). A Definition of 'Carbon Footprint'. Ecological Economics
Research Trends. C. C. Pertsova: Chapter 1, pp. 1–11. Nova Science Publishers, Inc, Hauppauge NY, USA. https://www.novapublishers.com/catalog/product_info.php?products_id=5999, also available as ISA-UK Research Report 07/01 from http://www.censa.org.uk/reports.html.

5. World Energy Council Report (2004). Comparison of energy systems using life cycle assessment.

6. Energetics (2007). The reality of carbon neutrality.

7. Walkers Carbon Footprint. http://www.walkerscarbonfootprint.co.uk/walkers_carbon_trust.html