1. Core Legal Answer & Context: The rules of strict liability and absolute liability are both doctrines that impose liability without fault, meaning a defendant can be held responsible for harm even if they were not negligent. However, absolute liability, a concept developed in India, is a more stringent form of liability than strict liability, which originated in English common law. The primary difference lies in the availability of defences.

Strict Liability (Rule in Rylands v. Fletcher): This rule, established in England, holds a person liable for damage caused by the escape of a dangerous thing from their land, even if they were not negligent. The essential conditions are: * Dangerous Thing: Something likely to cause mischief if it escapes. * Escape: The thing must escape from the defendant's land. * Non-natural Use of Land: The accumulation of the dangerous thing must be for a non-natural use of the land. * Damage: The escape must cause damage. Crucially, strict liability allows for several defences, such as Act of God, act of a third party, plaintiff's own default, consent of the plaintiff, and statutory authority. Thus, it is 'strict' but not 'absolute' because these exceptions can negate liability.

Absolute Liability (Rule in M.C. Mehta v. Union of India): This rule was propounded by the Supreme Court of India in response to industrial disasters, recognizing the inadequacy of strict liability in the context of hazardous industries in a developing country. It holds that if an enterprise is engaged in a hazardous or inherently dangerous activity and causes harm to anyone due to an accident in the course of carrying on such activity, the enterprise is absolutely and non-delegably liable to compensate all those who are affected by the accident. The most significant feature of absolute liability is that no defences are available to the enterprise. The enterprise cannot escape liability by proving that it took all reasonable care and that the harm occurred without any negligence on its part. The quantum of damages is also determined by the magnitude and capacity of the enterprise to pay, serving as a deterrent.

2. Relevant Statutes and Sections: These doctrines are primarily judge-made laws (common law principles) rather than statutory provisions. However, their principles have influenced environmental protection laws in India, such as the Environment (Protection) Act, 1986, and the Public Liability Insurance Act, 1991, which aim to provide relief to victims of industrial accidents.

3. 1-2 Important Landmark Cases:

• Rylands v. Fletcher (1868): This English House of Lords case established the rule of strict liability. A mill owner (Rylands) constructed a reservoir on his land, which burst and flooded a neighbouring mine (Fletcher). The court held Rylands liable, stating that "the person who for his own purposes brings on his lands and collects and keeps there anything likely to do mischief if it escapes, must keep it in at his peril, and, if he does not do so, is prima facie answerable for all the damage which is the natural consequence of its escape."
• M.C. Mehta v. Union of India (Oleum Gas Leak Case) (1987): This is the seminal Indian case that laid down the rule of absolute liability. Following an oleum gas leak from a Shriram Foods and Fertiliser Industries plant in Delhi, the Supreme Court, led by Justice P.N. Bhagwati, held that an enterprise engaged in hazardous activities has an absolute and non-delegable duty to ensure that no harm results from such activities. The Court explicitly rejected the applicability of the Rylands v. Fletcher rule and its exceptions in India for hazardous industries, stating that the enterprise must be held absolutely liable for any harm caused, without any of the exceptions available under strict liability. The court also introduced the concept of 'deep pockets' for determining compensation.

4. Clear Conclusion: The fundamental difference between strict and absolute liability lies in the availability of defences. Strict liability, as per Rylands v. Fletcher, allows for certain exceptions, making it a 'strict' but not 'absolute' form of liability. In contrast, absolute liability, as propounded in M.C. Mehta v. Union of India, is a more rigorous doctrine applicable to hazardous industries in India, where the enterprise is held liable for any harm caused without the possibility of invoking any defence. This makes absolute liability a more potent tool for victim compensation and corporate accountability in the context of industrial risks.