City A has two pillar industries, the chemical industry and tourism. The development of the chemical industry will inevitably lead to pollution and thus damage the ecological environment, but a good ecological environment is a necessary condition for the development of tourism. From this text, can it be inferred? ['Chemical industry and tourism should be replaced by other industries.', 'The city cannot develop the chemical industry and tourism at the same time.', 'The economic income of this city mainly depends on the chemical industry.', 'If the ecological environment is destroyed, the chemical industry cannot develop.']