Read the list of problems below. • Make sentences establishing the relation between cause and effect. Use the ideas below

1 Deforestation causes the lack of oxygen.2 Polluting the air is caused by heavy traffic.3 Species extinction is the result of air pollution.4 Ecological ignorance can cause the ecological disaster.5 Poisoning water causes severe diseases.6 Global wanning causes human health.7 Building huge cities causes air pollution.